MASTER RESET- Please respond ASAP

Hey everyone, I was wondering if someone could tell me how to master reset?? I have the CDM8900. And, does anyone know if a cell phone is dropped or ya know, beat up in any way, could the memory just kinda erase itself?? Like the force of the impact fizzled the phone's brain?? Thanks.

Sounds like it probably was damaged. If you can, take it back and get a new one. If not, oh well. As for a reset, about the best I can find is entering in ##1133(end aka red key) on it. Sets it back to factory settings