Hi everyone I am from chinese,I am sorry my English is too bad, I hope you can understand my N900 problem, my N900's imei number have changed to 12345610654321?,so please tell me how to do about it?

Commit bank fraud

Jokes aside, please give some more details of what you did before this change and somebody may be able to help you.

thank you after one flashing,it appear that problem,then I flashing again and again but the imei nunber can't change back,when i call someone,the call often automatically disconnected in about ten minutes

I think you flashed to an old version. Some changes in the gsm firmware happened around PR1.2 that prevent gsm to be used properly with older versions. Download the firmware labeled latest and flash again, your problem will probably be solved.

This is what i flashed RX-51_2009SE_20.2010.36-2.002_PR_COMBINED_002_ARM.bin . It might be the latest version. I am thinking if there is a way to change back the imei through X Terminal,Do you know where is the imei file store? thank you!

An IMEI normally does not suddenly change so I really wonder what you did before.

I just flashed it,probebly i flashed the wrong version which lead to the problem,

It is the latest, but it seems that you flashed the USA version. You said you are from china, so I'd recommend you flash again with

RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin

also if that doesn't fix the problem do a full flash both VANILLA and COMBINED, as stated in the wiki after you backup everything

My N900 version is the USA version,Although I flashed both VANILLA and COMBINED,I can't change back the IMEI number . so I think if I could change the IMEI number through the X Terminal?

Nice one, with (at the moment) 6 posts on the account and asking about that kind of stuff :-D