here is a ROM dumper for i900.
It's only tested on a clean WinXP computer

let me know if it works, and I will open a new topic for it.
I'm not sure yet how to reflash properly, but I've already reflashed using another os.nb as a base, I think it should be enough.
I did backup 2 files because I'm not sure yet which one I will use for the flash method. Both should contain your ROM.
Still trying to find how to flash back properly, but I miss time these days..
maybe at this time there will also be some problems with bootloader, because it's changed since the first ROMs..
note that it will only dump your PDA part, I didn't find how to dump the PHONE part nor the CSC
First install the .cab and reboot your device.
Then run the dumper on your PC and follow instructions.
Once done you should remove the cab (or flash your device !), as it adds a shortcut in startup to go to flight mode.
You can even not install it and modify the reg key by yourself.
I can upload a demo video if needed, but I don't think so

This post has been edited by lastnikita: 13 March 2009 - 12:36 AM