Difference beetween .nb and .nb0 files

[AlexeyGee]

Hi, guys!

I extracted 04_os.nb from excalibur (s620/t-mobile dash) rom.
I also have my personal os.nb0 file.

Question is what the difference beetween .nb and .nb0 files?

They seems to be similiar, except header and end of file.

I attached 2 pics of both file headers in hex. Can you please take a look?

I am really confused with this. Noone can answer.. :confused:

Thanks,
Alexey