Hello @zynthianers, @jofemodo, @riban,
After several unfruitful attempts at recovering externally the bootloader firmware of my Oram on Pi5 with nvme, following an apparently eventful testing branch update, I resolved to reset the whole contraption eventually.
Despite having followed the more or less reliable installing sequence we came up with in this forum, (with an SD - nvme - USB boot priority sequence), this time the system refuses to see the nvme drive with a freshly flashed Oram.
I have performed an internet search, but I have not been able to trace how to mount a “hidden” drive unit on Raspberry OS.
BTW, the procedure we shared on this forum, to point at the root partition of the nvme as starting drive for bootstrap, resulted in an endless alternating splash screen of Raspberry OS and Zynthian.
In a spirit of constructive criticism, I would advise to provide some more troubleshooting information on this forum or the Zynthian wiki, about system recovery and management of the Raspberry Pi, that after all accounts for about 60-70% of the hardware on which the project is based.
I am fairly sure that I would have avoided a toilsome reset process, had I been pointed at a procedure for loading the recovery.bin file on nvme (alas, no specific help on this topic was available, on the web or in the manual published by the Pi foundation).