Bambu Lab: How to downgrade firmware

In this guide, we'll show you how to downgrade the firmware of your Bambu Lab printer.

You may want to do this if your printer is affected by the new "Bambu Lab security firmware update", that blocks cloud-mode Bambu Lab printers from starting prints & performing any actions via SimplyPrint. More on this here; Bambu Lab security firmware "Authorization Control System" update: will I still be able to use SimplyPrint? and this article; Bambu Lab: printer stopped working after firmware upgrade / can't start prints anymore.

This guide only covers how to downgrade printers that are in Cloud Mode, and you have to use the "Bambu Handy" app

For a video guide, check out this YouTube short by "Ashley's Print Shop"; https://www.youtube.com/watch?v=3a1pyhDhC5o

Downgrade In Cloud mode with the "Bambu Handy" mobile app

If you don't yet have the Bambu Lab "Bambu Handy" app for iOS or Android, you can download it here; https://bambulab.com/en/download/app

Step 1: open Bambu Handy, and go to the printer in the "Devices" tab

Step 2: press the three horizontal dots in the top right corner (the "Hamburger Icon"), and click "Firmware Version

Step 3: here you'll see information about your firwmare; scroll down to the bottom

Step 4: Click "I want to downgrade to a previous version"

Step 5: find the version you want to downgrade to, and click it (older than, 01.08.03.00, e.g. 01.08.02.00)

The Bambu Lab "security firmware update" came out with the firmware version "01.08.03.00". Find a version below this - just the one that came right before will do - and click this

Click "Install this version", "Confirm", and wait

And that's it! Once it's finished installing, you'll be on an older firmware version.

Updated on: 18/03/2025