Hello,
DISCLAIMER:
I have searched through this forum and I couldn't get any exact info about what I can do with this problem. I don't like creating semi-duplicate threads, but I'd have to revive not-exactly-related ones otherwise.

My USB port had broken about two months ago. It wasn't much of a problem for me, as I could use the external charger. But then I wanted to try Nemo once again (I know, stupid decision in that situation), so I installed U-Boot and U-Boot bootable kernel power image.

I have installed U-Boot few times before, without any problem, but this time, I can start neither the original kernel nor kernel power (as I believe some boot files that were supposed to be generated are missing). I can start Nemo, though, and access the filesystem that way. I have done my backup and I eventually plan to solder the broken USB back, but here's my question now:

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With working U-Boot and microSD card boot, but without the possibility of booting straight into Maemo and without the USB port, is it possible to flash Maemo image back to the device (or revive it differently)?

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Thank you for your answers, in advance. I have bought a new N900, so this is not a matter of life and death, but it is sad having a half-dead one on my table.