Samsung Galaxy Pocket S5300 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.
Samsung Galaxy Pocket S5300 hard reset
Your device freezes or has fatal errorsIf your device freezes or hangs, you may need to close programs or reset the device to regain functionality. If your
device is frozen and unresponsive, press and hold [POWER] for 8-10 seconds, the device will reboot automatically or pull out the battery and then reinsert it. Replace the back cover and power on the device.

If this does not solve the problem, perform a factory data reset. In Idle mode, open the application list and select
Settings → Privacy → Factory data reset → Reset phone → Erase everything.
or Factory Format by entering S5300 RESET CODE
Use this method to hard reset your Samsung Galaxy Pocket S5300 phone: Enter *2767*3855#. Warning! All your data including contacts, messages etc. will be lost! Copy all your necessary data/Contacts/Messages etc. to SIM or make backup to your PC before full reset! Take out SIM card before full reset.
When disposing of your device, back up all data and then reset your device to prevent misuse of your personal information.