iatkos 5i not booting after update to 10.5.6

[eemerge]

I think i must have misunderstood, but i read that iatkos 5i can be updated like a regular mac..so i applied the update from inside the OS, and on reboot, it hangs.

Any ways to make it work or at least rever to 10.5.5 without reinstalling from scratch?