Hardware process:
- You need to remove the back cover from your phone, remove the motherboard from the existing battery, fingerprint sensor and camera.
- Remove the screws from the motherboard and take it out and put it in a safe place.
- On your motherboard, locate the six eMMC pins: Dat 0, CLK, CMD, GND, VCC, and VCCQ.
- Open the UFI and take out the adapter, you will see the exact same pins in the adapter I mentioned in the previous step.
- Solder 4 pins: Dat0, CLK, CMD and GND with jumper between motherboard and adapter. Leave VCC and VCCQ for USB to power them.
- Put the converter inside the UFI. Connect the box to the computer.
- Connect the motherboard to the phone's battery. Then put the USB cable in the phone and connect it to the computer.
Repair Samsung Galaxy M12 M127F dead boot or any brand phone you need two best devices in the market, one is easy jtag plus and the other is ufi box. These boxes help some phones after flashing the wrong software not showing start up on the screen.