Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media.
Sony Ericsson P900 soft reset
For P900 soft reset, simple take out the battery for 20sec, then reinsert it.
Sony Ericsson P900 hard reset
To master reset Sony Ericsson P900 : With the flip closed, push JOG wheel one click to UP + DOWN + DOWN + DOWN directions.
