This is often a sign of a corrupted firmware or a failed flash. Try booting into Recovery Mode (Volume Up + Power) and performing a factory reset from there. If that doesn't work, you'll need to use a computer to flash the stock firmware via SP Flash Tool .
: Obtain the Mobile Upgrade Tool from the official TCL Support website and install it on your PC. 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. This is often a sign of a corrupted
Warning: Do select "Format All + Download" unless absolutely necessary, as this can erase your phone's unique IMEI number and NVRAM calibration data, permanently breaking cellular connectivity. Step 6: Initiate the Flash : Obtain the Mobile Upgrade Tool from the
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