None of these picocom supported speeds make sense out of the output:
576000, 921600, 1000000, 1152000, 1500000, 2000000, 2500000, 3000000, 3500000, 4000000
I found out that the factory flash tool does not work anymore even when pressing the hidden button.
I have been trying to get https://github.com/pico-coder/sigrok-pico work on rpi pico or rpi pico w but there is a bug somewhere so I cannot used it yet. I did have not much trouble compiling it under linux. Should I get that to work, it should be fairly easy to figure out what is going on with the uart. There is an open issue on sigrok-pico about it.
So I did a backup restore and factory tool started working again. So I used factory tool again and I am basically back at day one. I do find it a bit strange that the factory tool did not work anymore after flashing. Cannot really think of anything I could do at this point though.
I think 5.15 kernel has writable ntfs support. I think ntfs-3g with write support has been stable for a long time by now. I cannot say I like the split file approach. Just to be clear, I think there is a good chance that the incomplete backups still manage to boot it is just that the backup being incomplete almost certainly breaks something.
Wifi is sp6330 on this board, ddr3 are samsung k4b4g0446c