[NiLuJe]

This is going to be tricky if you don't have your own backups, the export option fails, and you don't have shell access in diags.

You can't flash anything else than kernels & diags over fastboot, but an official update will only ship main & main kernel.

Diags appears to be functional(-ish), so the usual approach would be export + drop an official update in there.

Since that doesn't work, the second approach would be flashing it manually from diags over shell.

Which means that if you don't have shell access, and export is b0rked, you're in a bit of a bind.

I'd be curious in the exact chain of events displayed in the logs followed over serial when you attempt an export, because I wasn't even aware diags even *had* a YKNR screen. I knew it could boot you to main *to* a YKNR screen, but that's not the same thing.