Today, I attempted upgrading my FP2 to R without wiping /data: I followed the instructions from the command line installation instructions but left out
- “Installing a custom recovery” (I already had a recent TWRP)
- Step "4. Now tap
Format Data"
The phone booted (took significantly longer than usual, but I consider this to be expected in case of an OS upgrade). It then asked for the PINs of my two SIM cards (with the correct custom labels, so that information obviously had survived the upgrade).
However, every attempt at unlocking the phone (pattern) resulted in a black screen. After a moment, the screen requesting the lock pattern appeared again.
So, unfortunately, I consider this upgrade attempt failed. Let’s hope I can successfully revert to Q using the backup I did immediately before.
Maybe I missed some important step, but upgrading doesn’t seem to be as easy as hoped for.
Kind regards
Ingolf