Thanks for the reply! I’m not sure I quite understand that. My Fairphone 5 is new so I don’t think it’s unlocked. Do I just plug the usb cable into a laptop with power shell up? Do I leave the phone on the fast boot mode screen as shown in the photograph?
And what happens if you select START on that screen, does your phone display the boot animation (I presume it’s still dancing blue dots?) for a while or does it immediatelly fail and throw you back to a Fairphone logo and the bootloader afterwards?
Any error messages during the early boot process (before you end up in the bootloader screen)?
Edit: The more I read about people with similar problems the more this looks like a case where only contactsupport can help you. All solutions so far would involve an unlocked bootloader, if your phone doesn’t boot on it’s own.
If you can boot into recovery you could try a factory reset but that doesn’t restore partitions, not sure if that clears a DSU/GSI (and you would loose your data).
There really should be a big warning in the docs about not attempting it without an unlocked bootloader, and the system shouldn’t let you enable it if it’s locked.
I haven’t been following the FP5 releases (I’m on FP4), but if there’s a newer OTA available than what’s on your device you should be able to install a ota.zip via adb sideloading in recovery.
That should work with a locked bootloader and maybe that clears the DSU, no idea if it does honestly but worth a try