By this way you will reset all settings, contacts, messages from phone!
Here U go:
1) Connect your phone with pc, and run TkFe
2) Search PhoneFS for folder: SystemFS->Settings->PreConfiguration->Default->NV
3) Copy nv_original.ini to your Desktop for now.
4) Open nv_original.ini from desktop in notepad (or other text editor) and at the end of file add:
5) But "x" is a number of theme( i dont really know how many themes are predefinied, i tried only 6 first(0-5)
6) Save a file and copy with TkFe to SystemFS->Settings->PreConfiguration->Default->NV
7) Unplug your phone and type on phones keypad:
*#5239870*# to see admin menu
8) Choose Pre-configuration i enter a pass:
*#27236*# and OK
9) Choose one of profile (any of)
10) Phone will be restarted with new theme