· Austin Prysock

Bambu Lab Firmware Update Guide: X1C, P1S, P2S, A1, and A1 Mini (2026)

Complete guide to updating firmware on every Bambu Lab printer — X1 Carbon, P1S, P2S, A1, and A1 Mini. Covers OTA, Bambu Studio, Bambu Handy, microSD card methods, rollback/downgrade steps, common issues after updates, and post-update best practices.

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Bambu Lab firmware updates can add new features, fix annoying bugs, improve print quality — or occasionally break something that was working fine yesterday. Whether you’re running an X1 Carbon, P1S, P2S, A1, or A1 Mini, keeping your firmware current is important, but how you update matters just as much as whether you update.

I run six Bambu Lab printers (including three A1 Minis on 24/7 auto-loop production), and I’ve been through every firmware update cycle since 2022. This guide covers every method for updating, what the updates actually change, how to roll back when things go wrong, and the best practices I’ve developed from managing a multi-printer fleet.

Quick navigation:

Why Firmware Updates Matter

Bambu Lab printers run complex embedded software that controls everything from motor movements and temperature regulation to LiDAR scanning, vibration compensation, and AMS filament handling. Firmware updates can:

  • Fix critical bugs — failed first-layer inspections, AMS feed errors, WiFi disconnects
  • Add new features — motor noise cancellation, improved spaghetti detection, new UI elements
  • Improve print quality — better input shaping algorithms, refined pressure advance defaults
  • Patch security vulnerabilities — especially important after the 2024 authorization control system changes
  • Support new hardware — AMS 2 Pro compatibility, new hotend variants, new build plate types

That said, not every update is a must-install. Some updates have introduced regressions — AMS communication errors, calibration issues, or unexpected behavior changes. The community’s general advice: don’t update mid-production run, and read the changelog before you commit.

Before You Update: Pre-Update Checklist

Before touching firmware, run through this checklist. It takes two minutes and saves hours of troubleshooting:

  1. Finish any active prints. Never update with a print in progress or paused.
  2. Read the changelog. Visit Bambu Lab’s firmware download page and read what’s changed. Check r/BambuLab and the Bambu Lab Community Forum for user reports — wait 24–48 hours after a release if you’re risk-averse.
  3. Note your current firmware version. Write it down or screenshot it. You’ll need it if you need to roll back.
    • X1C/X1: Settings → Device → Firmware Version
    • P1S/P1P: Settings → Firmware Version
    • P2S: Settings → Device Info → Firmware Version
    • A1/A1 Mini: Settings → Firmware Version
  4. Ensure stable power. If your power flickers, plug the printer into a UPS. A power loss mid-update can brick the printer’s firmware, requiring an SD card recovery.
  5. Connect to stable WiFi. OTA updates require a solid internet connection. If your printer is in a garage or workshop with weak signal, consider a WiFi range extender or use the microSD card method instead.
  6. Back up your printer profiles in Bambu Studio (File → Export → Export Current Configuration).
  7. Update Bambu Studio first. Some firmware versions require a minimum Bambu Studio version. Update Studio before updating the printer.
  8. Update Bambu Handy on your phone. Same reason — newer firmware may require a newer app version.

Method 1: OTA Update (On-Printer)

This is the simplest method and works on all Bambu Lab printers with a WiFi connection.

X1 Carbon / X1

  1. Make sure your printer is connected to WiFi and powered on.
  2. The printer automatically checks for firmware updates and displays a notification banner on the touchscreen.
  3. Tap the notification or navigate to Settings → Firmware Update.
  4. Tap Update and confirm.
  5. The printer will download, verify, and install the firmware. The screen may go dark or show a progress bar.
  6. Do not power off the printer during the update. This typically takes 5–15 minutes.
  7. The printer will automatically restart when complete.

P1S / P1P

  1. Power on and ensure WiFi connection.
  2. The printer’s small screen will display a firmware update notification if one is available.
  3. Use the control dial to select the update notification and confirm.
  4. Wait for the download and installation to complete.
  5. The printer restarts automatically.

P2S

  1. Connect to WiFi and power on.
  2. Navigate to Settings → Device Info → Check for Updates on the touchscreen.
  3. If an update is available, tap Update Now.
  4. Wait for completion — the P2S will restart automatically.

A1 / A1 Mini

  1. Ensure the printer is connected to WiFi.
  2. A firmware update notification appears on the touchscreen when available.
  3. Tap the notification and confirm the update.
  4. Wait for the update process to complete (the screen shows progress).
  5. The printer restarts automatically.

Pro tip: If the OTA update notification doesn’t appear, restart the printer. It checks for updates on boot. You can also trigger an update check from Bambu Studio or Bambu Handy.

Method 2: Bambu Studio Update

Bambu Studio can push firmware updates to any printer on the same network or linked to your Bambu Lab account.

  1. Open Bambu Studio (make sure it’s the latest version).
  2. Go to the Device tab in the left sidebar.
  3. Select your printer from the list.
  4. If a firmware update is available, you’ll see a notification or a banner at the top of the device panel.
  5. Click Update Firmware and confirm.
  6. Bambu Studio sends the update to the printer. Monitor progress in Studio and on the printer’s screen.
  7. The printer restarts when the update completes.

This method is useful if you manage multiple printers — you can see all available updates in one place and update them sequentially.

Important: Both Bambu Studio and the printer must be on the same network (for LAN mode) or linked to the same Bambu Lab cloud account (for cloud mode). If you’re running the printer in LAN-only mode without cloud, you can only update via Bambu Studio on the same LAN or via microSD card.

Method 3: Bambu Handy App Update

The Bambu Handy mobile app (iOS and Android) can also push firmware updates.

  1. Open Bambu Handy and make sure it’s updated to the latest version.
  2. Go to the Device tab.
  3. Select your printer.
  4. If a firmware update is available, you’ll see a notification or a button to update.
  5. Tap Update and confirm.
  6. Monitor the progress on your phone and the printer’s screen.

Bambu Handy is especially useful for A1 and A1 Mini users who don’t always have a PC nearby, and it’s the only way to initiate firmware downgrades on most models (more on that below).

Method 4: MicroSD Card (Offline Update)

When WiFi isn’t reliable — or when you need to do a recovery flash — the microSD card method is your lifeline. This works on all Bambu Lab printers and doesn’t require an internet connection on the printer itself.

What You Need

  • A microSD card — 8GB or larger, formatted as FAT32. Bambu Lab recommends 32GB or smaller for maximum compatibility. The SanDisk Ultra 32GB is the standard recommendation.
  • A computer with internet access to download the firmware file.
  • A microSD card reader (most laptops have one, or use a USB adapter).

Steps for X1 Carbon / X1

  1. Visit Bambu Lab Firmware Download — X1 Series.
  2. Download the latest firmware .bin file for the X1C.
  3. Format the microSD card as FAT32 (right-click → Format on Windows, or Disk Utility on Mac).
  4. Copy the firmware .bin file to the root directory of the microSD card. Do not rename the file or put it inside a folder. Do not unzip it.
  5. Power off the X1C.
  6. Insert the microSD card into the printer’s SD card slot (located inside the front panel, near the build chamber).
  7. Power on the printer.
  8. The printer will detect the firmware file and prompt you to install it. Confirm the update.
  9. Wait for the update to complete. Do not power off.
  10. Remove the microSD card after the printer reboots.

Steps for P1S / P1P

  1. Download the firmware from Bambu Lab Firmware Download — P1 Series.
  2. Copy the firmware file to the root of a FAT32-formatted microSD card. Do not rename or unzip.
  3. Power off the printer.
  4. Insert the microSD card into the slot (on the side of the printer, behind the toolhead cable harness area).
  5. Power on. The printer detects the update file and begins installation.
  6. Wait for completion, then remove the card.

Steps for P2S

  1. Download the firmware from Bambu Lab Firmware Download — P2S.
  2. Copy the firmware file to a FAT32-formatted microSD card (or USB drive — the P2S supports both). Do not edit the filename or unzip the package.
  3. Insert the storage device into the P2S.
  4. Power on or restart the printer.
  5. The printer detects and initiates the update. Follow on-screen prompts.
  6. Wait for the reboot.

Steps for A1 / A1 Mini

  1. Download the firmware from Bambu Lab Firmware Download — A1 Series.
  2. Copy the firmware file to a FAT32-formatted microSD card.
  3. Power off the A1 or A1 Mini.
  4. Insert the microSD card (the A1’s microSD slot is on the back of the toolhead mount; the A1 Mini’s is in a similar location behind the screen).
  5. Power on. The printer detects the firmware file and starts updating.
  6. Wait for the reboot.

Critical: Never rename the firmware file, extract/unzip it, or place it in a subfolder. The printer looks for a specific filename in the root directory. Changing anything will cause the update to fail silently.

Printer-Specific Instructions

Bambu Lab X1 Carbon (X1C)

The X1C is Bambu Lab’s flagship and gets the most frequent firmware updates. It has a 7” touchscreen, built-in WiFi, LiDAR, and a camera. Key firmware update notes:

  • The X1C supports OTA, Bambu Studio, Bambu Handy, and microSD card methods.
  • After updates, the printer may prompt for motor noise cancellation calibration. Run it — it noticeably reduces stepper motor noise.
  • The X1C’s chamber temperature sensor and LiDAR can require recalibration after major firmware jumps.
  • X1C firmware includes AMS firmware. Updating the printer also updates the AMS (or AMS 2 Pro if connected).

Bambu Lab P1S

The P1S is the enclosed version of the P1P. It has a smaller screen and fewer onboard controls.

  • Update methods: OTA, Bambu Studio, Bambu Handy, microSD card.
  • The P1S does not have a touchscreen — navigate firmware prompts using the physical dial.
  • P1S firmware updates also include AMS firmware when an AMS is connected.
  • After update, run full calibration from the printer menu or Bambu Studio.

Bambu Lab P2S

The P2S is the newest mid-range model with an updated touchscreen interface.

  • Supports OTA, Bambu Studio, Bambu Handy, microSD card, and USB drive updates.
  • The P2S uses a USB-A port for offline updates in addition to microSD.
  • Firmware may require Bambu Studio v2.3.0+ for compatibility.

Bambu Lab A1

The A1 is Bambu Lab’s open-frame bedslinger with an AMS Lite system.

  • Update methods: OTA, Bambu Studio, Bambu Handy, microSD card.
  • AMS Lite firmware is bundled with the printer firmware — a single update covers both.
  • The A1’s microSD card slot is accessed from the rear of the toolhead mount area.
  • The A1 uses a different firmware branch than the X1/P1 series, so version numbers won’t match.

Bambu Lab A1 Mini

The A1 Mini shares the same firmware platform as the A1 but with adjustments for the smaller build volume.

  • Same update methods as the A1.
  • AMS Lite firmware is included in the update package.
  • The A1 Mini is more sensitive to WiFi signal strength during OTA updates due to its compact antenna. If OTA updates fail or get stuck, use the microSD card method.

What Firmware Updates Actually Change

Bambu Lab firmware updates typically include changes in these categories:

  • Refined input shaping (vibration compensation) algorithms
  • Better pressure advance tuning for smoother extrusion
  • Improved first-layer scanning and compensation (LiDAR-equipped models)
  • Enhanced spaghetti/failure detection accuracy

AMS and Filament Handling

  • AMS feed reliability improvements
  • Better filament runout detection
  • Improved filament buffer behavior
  • New filament profile support

Connectivity and Software

  • WiFi stability improvements
  • Cloud communication reliability
  • Bambu Studio/Handy compatibility updates
  • LAN mode improvements
  • Third-party integration support (OctoPrint, Home Assistant, SimplyPrint)

UI and Interface

  • Touchscreen interface updates (X1C, P2S, A1, A1 Mini)
  • New settings and configuration options
  • Status display improvements

Security

  • Authorization control system updates (the 2024 security changes that required Bambu Lab account binding)
  • Encrypted communication between printer and cloud
  • Access control for LAN mode

Bug Fixes

  • Motor driver stability
  • Temperature sensor reading corrections
  • Print pause/resume reliability
  • Time-lapse recording fixes

To see the specific changelog for your printer model, visit:

How to Roll Back (Downgrade) Firmware

Sometimes a firmware update introduces more problems than it fixes. Here’s how to go back to a previous version.

This is the official and easiest method for downgrading firmware on all Bambu Lab printers.

  1. Open Bambu Handy on your phone (make sure it’s the latest version).
  2. Go to the Device tab and select the printer you want to downgrade.
  3. Tap the menu icon (≡) in the top-right corner.
  4. Tap on the Firmware Version line.
  5. Scroll down to find the option: “I want to downgrade to a previous version.”
  6. Tap it and confirm.
  7. The app will present available previous firmware versions. Select the version you want.
  8. The printer downloads and installs the older firmware. Wait for the restart.

Important notes on Bambu Handy downgrades:

  • Your printer must be connected to the internet and bound to your Bambu Lab account.
  • The app must be logged into the same account the printer is bound to.
  • Not all previous versions may be available — Bambu Lab controls which versions are offered for downgrade.
  • After downgrading, run a full calibration.

Method 2: MicroSD Card with Older Firmware

If you have a previously downloaded firmware .bin file, you can flash it via microSD card:

  1. Place the older firmware file on a FAT32-formatted microSD card.
  2. Follow the same microSD card update steps for your printer model (see above).
  3. The printer should accept the older firmware and install it.

Caveat: Bambu Lab doesn’t always make older firmware files available on their download page. If you didn’t save a copy of the old firmware, this method may not be an option. Best practice: save a copy of your current firmware .bin file before updating to a new version.

Method 3: Contact Bambu Lab Support

If your printer is bricked or you can’t downgrade through the app:

  1. Open a support ticket at Bambu Lab Support.
  2. Describe the firmware issue and request a recovery file.
  3. Bambu Lab support can provide a special recovery firmware file to copy to a microSD card.
  4. Flash the recovery file using the microSD card method.

This is the nuclear option, but Bambu Lab support has been responsive about providing recovery files for firmware-bricked printers.

Common Issues After Firmware Updates

Here are the most frequently reported problems after Bambu Lab firmware updates and how to fix them:

1. AMS Communication Errors

Symptoms: “AMS communication error,” filament stuck warnings, AMS not recognized.

Fix:

  • Power cycle the printer completely (off for 30 seconds, then back on).
  • Unplug and re-seat the AMS cable connection (both the AMS side and the printer side).
  • If the error persists, try updating the AMS firmware separately — sometimes the AMS firmware gets out of sync with the printer firmware. In Bambu Studio, check Device → AMS → Firmware.
  • As a last resort, downgrade using Bambu Handy and re-update.

2. Calibration Failures

Symptoms: Vibration compensation calibration fails, motor noise cancellation won’t complete, flow calibration gives incorrect results.

Fix:

  • Restart the printer and try calibration again.
  • Make sure the build plate is clean and properly seated.
  • For vibration compensation failures, ensure nothing is physically touching or restricting the toolhead or bed movement.
  • If calibration repeatedly fails, downgrade firmware via Bambu Handy, calibrate successfully, then re-update.

3. WiFi Connectivity Issues

Symptoms: Printer loses WiFi connection, can’t connect to Bambu Cloud, prints won’t start remotely.

Fix:

  • Forget the WiFi network on the printer and reconnect.
  • Restart your router.
  • If using 5GHz WiFi, try 2.4GHz — the A1 Mini and P1S in particular have better reliability on 2.4GHz.
  • Check that your router firmware is up to date.
  • Consider a dedicated WiFi access point near your print farm.

4. Print Quality Regression

Symptoms: Layer lines worse than before, stringing increased, first layer issues, dimensional accuracy changed.

Fix:

  • Run full calibration: vibration compensation, flow calibration, and motor noise cancellation.
  • Re-slice your models in the latest Bambu Studio — some firmware updates change default acceleration or jerk values.
  • Check if your filament profiles need updating (Bambu Studio may have new default profiles after an update).
  • Print a calibration cube or Benchy to establish a new baseline.

5. Firmware Update Stuck or Failed

Symptoms: Progress bar frozen, printer unresponsive during update, update restarts but never completes.

Fix:

  • If stuck downloading (e.g., frozen at 25%): Wait at least 30 minutes. If still stuck, power cycle the printer and try again. If OTA keeps failing, use the microSD card method.
  • If stuck during installation: Do NOT power off if possible — wait up to an hour. If the printer is completely unresponsive for over an hour, power cycle and try the microSD card recovery method.
  • If the printer won’t boot after a failed update: Use the microSD card method with the latest firmware. If that doesn’t work, contact Bambu Lab support for a recovery image.

6. “Toolhead Fell Off” Warning

Symptoms: False “toolhead fell off” error immediately after update, especially on P1S.

Fix:

  • This is typically a sensor calibration issue introduced by firmware changes.
  • Restart the printer.
  • Check the toolhead cable connection.
  • If persistent, downgrade firmware and wait for a fix in the next release.

7. LiDAR / First Layer Scan Issues (X1C)

Symptoms: First layer scan takes much longer, false positive failure detection, scan never completes.

Fix:

  • Clean the LiDAR sensor window with a microfiber cloth.
  • Run the LiDAR calibration from Settings → Maintenance.
  • Make sure the build plate surface is clean — residue or PVA glue buildup can confuse the scanner.
  • If using a third-party build plate, the new firmware may not recognize it. Try with the official Bambu Lab plate.

Post-Update Best Practices

After every firmware update, follow this routine to ensure everything is working correctly:

1. Run Full Calibration

This is the single most important post-update step. From the printer’s menu or Bambu Studio:

  • Vibration compensation calibration (all models)
  • Motor noise cancellation (X1C, P1S)
  • Flow calibration (optional but recommended)

Bambu Lab’s own FAQ states: “We recommend a complete calibration of the printer every time you install a firmware update, change the location of the printer, perform belt tensioning, or do any changes to the machine.”

2. Print a Test Model

Before resuming production, print something small:

  • A calibration cube (20mm XYZ cube)
  • A Benchy
  • A single-wall tolerance test

This catches print quality regressions before they ruin a 12-hour production print.

3. Check AMS Functionality

If you have an AMS or AMS Lite:

  • Load and unload filament from each slot.
  • Run a short multi-color print to verify color changes work.
  • Check that filament types are correctly detected (if using RFID filament).

4. Verify Remote Connectivity

  • Send a print from Bambu Studio to verify cloud or LAN connectivity.
  • Check the camera feed.
  • Verify that Bambu Handy can see and control the printer.

5. Update Your Slicer

Make sure Bambu Studio (or OrcaSlicer, if you use it) is compatible with the new firmware version. Some firmware updates change G-code behavior or add new features that require slicer support.

6. Monitor the First Few Prints

Don’t start a 48-hour print farm run immediately after updating. Watch the first 2–3 prints for any anomalies — unusual noises, unexpected pauses, temperature fluctuations.

Firmware Update FAQ

Q: Should I update firmware as soon as a new version is released? A: Not necessarily. Unless the update fixes a critical bug you’re experiencing, it’s smart to wait 24–48 hours and read community feedback on r/BambuLab and the Bambu Lab forums. I typically wait 2–3 days before updating my production printers.

Q: Can I skip firmware versions? A: Yes. You can jump from any older version to the latest version directly. You don’t need to install every intermediate update.

Q: Does updating firmware reset my printer settings? A: Generally no — your WiFi settings, calibration data, and most preferences are preserved. However, some major updates may reset certain calibration values, which is why running calibration after every update is recommended.

Q: What if I’m using OrcaSlicer instead of Bambu Studio? A: Firmware updates can still be pushed via Bambu Studio even if you primarily use OrcaSlicer for slicing. You can also update via the printer’s touchscreen (OTA) or Bambu Handy. OrcaSlicer doesn’t have firmware update functionality.

Q: Do firmware updates affect my warranty? A: No. Installing official Bambu Lab firmware updates does not void your warranty. However, installing third-party or modified firmware would.

Q: My printer is in LAN-only mode. Can I still update? A: Yes, but only via Bambu Studio on the same local network or via the microSD card method. OTA updates require a cloud connection.

Q: How do I know which firmware version I’m currently running? A: Check Settings → Device Info (or Firmware Version, depending on the model) on the printer’s display. You can also see it in Bambu Studio’s Device tab or Bambu Handy’s device page.

Q: Can firmware updates fix hardware problems? A: Sometimes. Firmware can compensate for sensor drift, improve motor control, or add workarounds for hardware issues. But if you have a physical defect (cracked part, bad connection), firmware won’t fix that.

Having the right accessories makes firmware updates (and general printer maintenance) much smoother:

  • SanDisk 32GB MicroSD Card — The go-to for offline firmware updates and print file storage. 32GB, FAT32, works perfectly with all Bambu Lab printers. Keep one dedicated to firmware updates.

  • USB MicroSD Card Reader — If your laptop doesn’t have a built-in SD card slot. Essential for the offline update method.

  • APC UPS Battery Backup — Protects against power loss during firmware updates (and during prints). A power interruption mid-flash can brick your printer. Worth every penny for a print farm.

  • TP-Link WiFi Range Extender — If your printers are in a garage or workshop with weak WiFi, this prevents OTA update failures and dropped connections during remote prints.

  • Bambu Lab Official Build Plates — After firmware updates that change first-layer detection, the official plates give the best compatibility with LiDAR scanning. Third-party plates sometimes trigger false scan failures after updates.

  • Microfiber Cleaning Cloths — For cleaning the LiDAR sensor and camera lens on the X1C, which should be done after any firmware update that changes scanning behavior.

Final Thoughts

Firmware updates are a routine part of owning a Bambu Lab printer, and understanding the process takes the stress out of it. The key takeaways:

  1. Always read the changelog before updating.
  2. Don’t update mid-production. Finish your prints first.
  3. Keep a microSD card ready as a backup update method.
  4. Run full calibration after every update — no exceptions.
  5. Wait 24–48 hours after release if you’re running production printers.
  6. Know how to roll back via Bambu Handy before you need to.
  7. Save old firmware files so you can manually downgrade via microSD if needed.

Your printers are tools. Keep them updated, but do it on your schedule — not the notification’s.

Running a Bambu Lab print farm? Check out our Bambu Lab AMS Troubleshooting Guide and Best Bambu Lab Accessories for 2026 for more tips on keeping your fleet running smoothly.

Post-update calibration failing? Firmware updates can break nozzle offset calibration and flow settings. Our H2C Vortek Calibration Guide ($24.99) and P2S Calibration Guide ($19.99) include firmware-specific troubleshooting and recovery procedures.

This article contains affiliate links. When you purchase through these links, ADP Industries earns a small commission at no extra cost to you. We only recommend products we actually use in our own print lab.