UART Boot DNS-320 B1 with broken NAND (3 replies)

Hi there.
Ive got a Problem with my old D-Link NAS.
The NAND Flash is broken and i hoped that i can Boot it via UART and maybe solder in a new NAND Flash or boot from USB.
The NAS is a DNS-320 rev.B1

with Marvel 88f6702 SoC

I so far tried allot uboot.kwb Files that i found.
Allso followed this Instructions, but without luck.


kwboot either stops with xmodem: bad message
or
after sending the boot image

Hopefully someone can help.