Fastboot Commands Not Working on GrapheneOS: How to Fix

In this guide, we will show you the steps to fix the issue of Fastboot Commands not working on GrapheneOS. So I recently flashed the Android 16 build of this ROM and then locked the bootloader as well. This is a practice that I’ve been carrying out for ages. But at the same time, my dependency on Google apps is so much that it’s way too hard for me to survive in a de-Googled ecosystem. And using a locked device isn’t my cup of tea as well.

So I straightaway went to unlock the bootloader and move over to a different Custom ROM. But surprise, surprise- the Fastboot Mode was not working! Initially, I attributed it to the usual USB cable and ports. So I tried switching over to a different port and tried a different cable as well. But unfortunately, nothing changed. To give you a hint, here’s my setup:

• The device was Pixel 6A and the OEM Unlocking was enabled.
• I was still able to access the OS, the device wasn’t softbricked.
• Even the Device Manager was able to detect the device in Fastboot Mode as it showed it as Android Bootloader Interface.
• Fastboot commands were still working well and good across my other devices. The issue was only with my Pixel running Graphene.
• Other tools dependent on Fastboot, such as Android Flash Tool, are also not working.

After trying out numerous workarounds and even going through their forums [GrapheneOS], nothing worked out. I then did what always works out for me- take a break and then come back. And guess what? It did work for me this time around as well. So without further ado, let’s make you aware of how exactly was I able to rectify this issue. Follow along.

Fix Fastboot Commands Not Working on GrapheneOS

Since I had flashed the GrapheneOS via the WebUSB Installer method, I once again opened that and then hit the Unlock Bootloader button. Guess what? My bootloader was unlocked straightaway. After that, I erased the custom Android Verified Boot key to untrust it [which is always advised before flashing the stock firmware]. After that, I was able to flash the factory image via Android Flash Tool and then the underlying issue was rectified.

Since I was able to only carry out the tasks associated with Fastboot Commands [such as bootloader unlocking] task using the WebUSB Installer method and not via the CMD window, I guess the culprit is the former only, though I am not able to say that with cent percent certainty. UPDATE: The culprit is indeed WebUSB Installer, as flashing the GrapheneOS ZIP on top of WebUSB Installer fixes the issue [see below].

When I flash this ROM the next time, I’ll use the Command Line Interface approach and will then see if the Fastboot Commands work or not. If they do, the culprit is right in front of our eyes. For now, let’s give the WebUSB Installer the free pass due to the element of uncertainty. With that said, here are the steps you need to take to rectify this problem.

Instruction Steps

1. First off, head over to the GrapheneOS WebUSB Installer .
2. Then go to “ Unlocking the Bootloader ” and click on Unlock Bootloader.
3. You’ll get a prompt on your device. Use the Volume Keys to highlight Unlock the bootloader and press the Power key to confirm.
4. Now, if you want to flash the stock firmware as well, then first delete the Custom AVB as well.
5. For that, scroll to “ Replacing GrapheneOS with the stock OS ” and click on Remove Non Stock Key.
6. After that, download the GrapheneOS ROM ZIP file for your device from here.
7. Extract it and launch the flash-all.bat file to flash the GrapheneOS once again.
8. Once flashed, you’ll be in Fastboot Mode, and the commands will now work!
9. You may now flash the stock firmware via Android Flash Tool [recommended].

• Fix GrapheneOS stuck at’Phone is starting’ after enabling Zygisk
• How to Install Android 16 Custom ROMs on Pixel 6/7/8/9
• List of all Custom ROMs available for Android Devices
• How to Flash HelluvaOS/HentaiOS ROM and Lock Bootloader
• How to Flash HelluvaOS/HentaiOS ROM and Lock Bootloader

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