reset Samsung C3300K Champ
Menu > Settings > Reset > Reset settings > tick or untick any of the following options:
once you've chosen the options to reset, press Reset, enter your password and press OK.
Use this method to hard reset your Samsung GT-C3300K Champ phone: Enter *2767*3855#. Copy all your data/Contacts/Messages etc. to SIM or make backup to your PC! You need Samsung PC suite sync tool or Kies.
If your phone is frozen take out battery and reinsert it. Simple C3300K soft reset.
There is a way you to reset software, you can reflash your C3303K firmware with flash loader 7.7.x
Turn off C3300K and connect it to PC using microUSB cable and Press VOLUME DOWN + LOCK key combo while you connect your champ phone. Install driver and flash loader software.
Press SET MODEL button Select C3300_LIBRE_Setting_v02.mdl and select application binary C3300KJP.ptt
Select C3303KJPJI2.tfs and
Select CSC File C3303KOJPJI1.csc
Start flashing and reconnect using microUSB cable and Press VOLUME DOWN + LOCK key combo while you connect your champ phone.