: Check sites like Firmware.center or Lolinet for stock ROMs filtered by your specific CID and model.
To recover a dead or bricked powered by the MediaTek Helio P15 (MT6755) : Check sites like Firmware
To fix the error, ensure the following options are unchecked or set correctly: connect the device to your PC.
: Power off your phone completely. While holding the Volume Down button (or sometimes no buttons at all depending on state), connect the device to your PC. : Check sites like Firmware