Hello,
Sorry for late response, I was only checking the forums occassionally to see if someone has managed to perform a firmware upgrade on a device with the fairphone transplantation (as far as I know, no one did)
Because of the uncertainty after the transplantation procedure I'm still running firmware 4.1.1 with fingerprint GV2.023.SQ83A and I've uploaded the extracted partitions here:
https://github.com/ardyln/boox-xbl