Click the green button at the top of the interface. The tool is now waiting for the device to connect. Turn off your TCL 502 completely.
Once completed, a green circle with a checkmark labeled will pop up on your screen. Step 5: Reboot Your Device Firmware TCL 502
While holding down the (or Volume Up, depending on the specific sub-variant) button, connect the phone to your PC using the USB cable. Click the green button at the top of the interface