Debrand/Decustomize Nec 338
 

Hello, recently a friend came to me with a 338 phone. It's powered by the operator 3 or perhaps 3g. I want to debrand this phone completely so that I can use my operator's settings to enable 3g communications. Can someone here tell me how is it possible?? Where can i find a fully decustomized flash for the 338? One last thing, can u tell me whether IMEI needs to be rebuilt and how this can be done??thanks for help in advance.

Cheers,
Yasir