tstrap into the USB slot. There is still no response.
First, check the model and serial number of MacBook. Remove the lower case. And disconnect the battery. Locate the SAM Socket on the logic board. Connect the programmer with the computer. Install the unlock software. Connect the corresponding SAM Socket FPC with the programmer. Then connect pin 1 of the FPC with Pin 1 of the SAM Socket.
Get the MacBook power supplied with an external power source. Hold the power button to turn off the