Thanks you two. This worked for me as well.
To summarize my approach:
* Format nvme using fdisk or gnome-disk
* APT install rsync
* reform-migrate from terminal
* reform-boot-config nvme
* open reform, loosen the screws on the heatsink(you don't have to remove it, just lift it a little to get to the switch) and change the dip switch to off
* flash the new u-boot version
Thanks very much guys, system is working and Iām typing from my reform 