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# 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?](https://help.simplyprint.io/en/article/bambu-lab-security-firmware-authorization-control-system-update-will-i-still-be-able-to-use-simplyprint-y2uoor/) and this article; [Bambu Lab: printer stopped working after firmware upgrade / can't start prints anymore](/en/article/bambu-lab-printer-stopped-working-after-firmware-upgrade-cant-start-prints-anymore-pjmcrt/).

| 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
### ![Open Bambu Handy](https://storage.crisp.chat/users/helpdesk/website/ff22a914001c1000/img3720_g8pgs6.png =498x1080)

### Step 2: press the three horizontal dots in the top right corner (the "Hamburger Icon"), and click **"Firmware Version**
### ![](https://storage.crisp.chat/users/helpdesk/website/ff22a914001c1000/img3721_1jk5osk.png =498x1080)

### Step 3: here you'll see information about your firwmare; scroll down to the bottom
### ![](https://storage.crisp.chat/users/helpdesk/website/ff22a914001c1000/img3722_19w2s4v.png =498x1080)

### Step 4: Click "I want to downgrade to a previous version"
### ![Scroll down to the buttom](https://storage.crisp.chat/users/helpdesk/website/ff22a914001c1000/img3723_1j4xp7d.png =499x1080)

### 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
### ![Select previous version you want to downgrade to](https://storage.crisp.chat/users/helpdesk/website/ff22a914001c1000/img3724_753gfa.png =499x1080)
### ![Click downgrade](https://storage.crisp.chat/users/helpdesk/website/ff22a914001c1000/img3725_1co5tde.png =499x1080)

### Click "Install this version", "Confirm", and wait
### ![Click confirm](https://storage.crisp.chat/users/helpdesk/website/ff22a914001c1000/img3726_1akbcyp.png =499x1080)
### ![You are now downgrading](https://storage.crisp.chat/users/helpdesk/website/ff22a914001c1000/img3727_8yyaaf.png =499x1080)

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