Readynas 102 uboot error (no replies)

Hello everyone,

i got my hands on an old Readynas102 and wanted to install Debian on it, using one of the superb guides on this forum.

I connected my Readynas over the serial to my laptop and i don't see any UBoot login, i only get error messages:

....
BootROM: Bad header at offset 00B80000
BootROM: Bad header at offset 00B90000
BootROM: Bad header at offset 00BA0000
BootROM: Bad header at offset 00BB0000
BootROM: Bad header at offset 00BC0000
BootROM: Bad header at offset 00BD0000
BootROM: Bad header at offset 00BE0000
BootROM: Bad header at offset 00BF0000
...

I tried the USB recovery to reflash the MTD but that didn't help. Maybe someone has an idea, what i could do?

The device is working fine, but i cannot reach the uboot console to interrupt the boot process.

Thanks everyone.