1. Power on the phone.
2. Tap 7 times on 'Build number' in 'Settings'-'About phone' to enable 'Developer options',
go to 'Settings'-'Developer options' and enable 'USB debugging'.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Select device in ADB settings.

open lang po usb debugging no need na iopen oem unlocking
dial *#0808# sundan nlng po ss sa baba
open z3x box
click correct model sm-a107f
click unlock
click read codes
wait until finish