To see if one bug was already resolved or still present in the previous FP-OS version, I was just curious of downgrading my FP4, just by switching between A/B slots. (I don’t want to do a factory reset nor a fresh install!)
I got the current slot (b) with fastboot getvar current-slot and then fastboot --set-active=a and fastboot reboot but then I was stuck in a bootloop
After typing fastboot --set-active=b all was back to normal
My question: is this bootloop an expected behaviour? or it should have booted to previous version?
As far as I know a downgrade is only possible automatically if something went wrong during an OTA update. Once the updated system boots successfully Rollback-Protection kicks in and the old slot is no longer bootable.
I have tried multiple times under different circumstances and so far haven’t been able to go back to a previous version.
Edit: The thread @AnotherElk linked already mentions rollback protection, should have looked first, so nothing new here…
Yes, I agree that it looks like rollback-protection is making the idea impossible.
What I tried:
System startng /e/OS successfully from slot b. I’ve flashed the same /e/OS version (only uncritical partitions) onto slot a (didn’t touch slot b at all). After starting successfully from slot a this did always work, but trying to start from slot b was noch longer possible (bootloop).