Dopod 900 -- Need to do a ROM backup

[linj]

My friend's Dopod 900 from Taiwan uses the CHT rom version. I'm looking for a method to dump it or otherwise save all three ROMs - radio, extended, and core - so I can test it with an English ROM (for some reason, perhaps hardware based, after playing music/video for a long while, the entire audio system no longer works). He doesn't want to void the warranty (too obviously).

Any suggestions on how to do this? Oh, and I can't read Chinese,... so any method that requires phone-based procedure will be a bit tough.

Any input will be greatly appreciated!