Thanks for your advice! sadly I was not able to fix the original issue yet - 15 seconds each time is quite frustrating.
Instead I reverted to flash my backup.
At the moment I am stuck at enabling ssh on my diags partition (to flash mmcblk0p1.img)
I have the notion that neither
ixtabs pack nor one of the ssh enabled diags partitions might work for my pw2
Do you have any other idea how to get a shell (with dd) that does not reboot after 15 secs?
EDIT: ah ok found out
just quit the shell hmm ...