Hi. I suggest you reload your device's firmware afresh
1. http://www.satechhelp.co.za/10994/Mobicel-Cherry-Firmware-Flashing-Tutorial for Single SIM version or
2. http://satechhelp.co.za/14544/Download-Flash-Mobicel-Cherry-Dual-Sim-P9120-Stock-Firmware for Dual SIM version
1. http://www.satechhelp.co.za/10994/Mobicel-Cherry-Firmware-Flashing-Tutorial for Single SIM version or
2. http://satechhelp.co.za/14544/Download-Flash-Mobicel-Cherry-Dual-Sim-P9120-Stock-Firmware for Dual SIM version