While I was about to root a FP3 I was reading the Magisk install guide again and I was wondering why vbmeta is part of the Magisk guide at all - even clearly stated as optional.
(Optional) If your device has a separate
vbmetapartition, you can patch the
vbmetapartition with command:
fastboot flash vbmeta --disable-verity --disable-verification vbmeta.img(note that it may wipe your data)
First I tried to understand what vbmeta actually is - found this nice page:
So high level explained vbmeta is a partition, which consists a lot of Meta-Data (hashes, hash trees, signing keys, etc.). It is part of / needed for AVB (Android Verified Boot).
I will probably never be an expert of this, but I was ok with the stuff I understood and wanted now to understand the role in the root process. But I could not really wrap my head around it.
Rooting will make certain things (relock bootloader, verified boot, OTA Updates [at least not without following workarounds]) impossible anyway.
So can one explain why it is actually in there? In which situations would it make sense to flash it?