Well this is why I asked if it was a common issue with /e/ on guacamoleb, I tried both the release on the website and a self-compiled version of the ROM and both have the same issue. I tried to flash the stock vendor partition but it didn’t boot, so I guess the problem doesn’t come from there?
I have no idea if the OnePlus 7 is a GSI device, I would say yes because it’s fairly recent and it has treble, AB partitions, system-as-root and all the stuff.
See, here’s the thing - to me, there is no such thing as a downgrade. When I flash the ROM, either the stock one or /e/ or any other ROM, all partitions are replaced. I have no leftover of the stock ROM simply because it has been entirely overwritten (boot, system and vendor). I can go from any version to any version without troubles.
…so, I am genuilely asking if am I missing something here? Is there another partition that I’m not aware of and that I need to flash… ? One that’s not overwritten by custom ROMs ?
Sorry for my mistyping. I mean treble. If your device us a treble device you can flash every GSI image. GSI image is a system image for treble devices.
I know fron my device, that there are more partitions like ‘modem’.
So i really woukd use the GSI image from xda