I have a Nokia Nuron 5230 - and recently I've realized that I must have changed the security code on the phone as I tried to do a factory reset and when it asks for the code - I put in the default of 12345 and it tells me that's the wrong code... Is there a way to get the code reset?
Call Tmobile customer service or you can use live chat
and they can help you.
T-Mobile support recommended a vendor to reflash the phone which fixed the issue.
Retrieving data ...