Have you got a link or something to login and download firmware updates, if so check there. If not, did you try the keys like PS3 has (L+R+Select+Square) to get to the unlock screen?
If you can get to the unlock screen:
- try the latest PS3 (4.00) code 0219
- try bruteforce seems to be the last resort :(
Other things to try:
- Go to Settings > System > System Information
- Press simultaneously R + L + DPad Left + Square for a few seconds
- Release those buttons then immediately press the start button
What does it say there?
You may want to try to go to recovery and check the options there:
http://www.youtube.com/watch?v=ublLC235QV0
This is for 1.5.1, 1.5.0 is a bit harder to enter!
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