Various GoFlex Net devices with unknown state (2 replies)

Hi,

I got 3 devices (GoFlex Net) and tried to boot Debian Wheezy and Jessie on them - without success.
No device receives an IP adress when booting without a stick, but according to the owner of the devices an old version of uBoot was used to open the devices for the use with Debian or ArchLinux (ALARM).

Is it possible to boot a rescue system or similar from stick, install a current uBoot and flash it to NAND ?
How can I do this - does an rescue-image exist that I can copy to an USB stick and boot from that ?

Thanks in advance

Kind regards
Valentin