Format internal disk Sony Ericsson P990i Symbian hard reset

Switch to P990 service menu

Hold down Space key on QWERTY hard keyboard

Jog Dial Up / Press * + Jog Dial Down / Jog Dial Down / Press * + Jog Dial Down / Press *, then choose format internal disk


Master reset

Use Master reset to reset your phone

Important: All user data, as well as pre-installed media
files and application data files (including, for example,
backgrounds, ringtones and pictures), will be deleted
and settings will be set to the state they were after you
selected the language. The selected local language will
be restored.

If you want to keep installed applications, unmark the
Delete user installed applications check box.

Soft reset Reboot

Press and hold the Power button for about 10 seconds


Master reset Sony Ericsson P990i


Use Master reset to reset your phone

Control panel -> Other -> Mater reset


Important: All user data, as well as pre-installed media
files and application data files (including, for example,
backgrounds, ringtones and pictures), will be deleted
and settings will be set to the state they were after you
selected the language. The selected local language will
be restored.

If you want to keep installed applications, unmark the
Delete user installed applications check box.


OR
If nothing works: As last resort do a Sony Ericsson phone repaire with PC Suite. USE THIS METHOD FOR hard reset AFTER INSTALLATION----> TOOLS > PHONE REPAIR
Sony Ericsson phone repaire pc suite tools
http://www.sonyericsson.com/cws/support/softwaredownloads/detailed/pcsuite/aino?cc=gb&lc=en

Sony Ericsson  phone repaire pc suite tools
Sony Ericsson  phone repaire pc suite tools