NSA325 v2: stuck on Bad Magic Number (no replies)

Hi Forum!
what a pity I found you only a few hours ago.
I have a NSA 325 v2: a friend told me that I can put Debian on it..
googling NSA325 debian I went to the wrong wiki :( (zyxel.nas-central.org/wiki/Debian_on_325, which is outdated).

What I did:
At the Marvell>> Prompt

Marvell>> resetenv
Marvell>> reset

The device rebooted.

At the Marvell>> Prompt again

Marvell>> saveenv
Marvell>> reset

Now I have the Bad Magic Number message.

I cannot proceed there since files are missing (create boot partition, create rootfs partition). I tried to replace the missing files with the files found here: the system boot, but then stops loading linux due to some incompatibility.

I tried then to follow your how to (creating 1 partion ext3 and so on), but again I have the bad magic number message.

Is there a way to reset back to stock, so that I can start from scratch using your tutorials?

thanks a lot