Vodafone hard reset
Vodafone 555 hard reset
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.
Vodafone 555 hard reset
Try G key + Power on the device.Select to restore factory settings.
All user data, files and downloaded applications will be lost permanently.
You may also realize factory reset using hard keys: hold down key G* and press POWER key at the same time.

or
Press Menu
Scroll to Settings, then press Select
Scroll to Factory reset, then press OK
Press Yes.