Have you tried to root your device or install a custom mod and now the phone is stuck on the TCL logo? This is called a "soft brick." Reinstalling the stock firmware is the only reliable cure.
For most users: on TCL 20E unless bootlooped or upgrading via official OTA. There’s little custom ROM community support, and mistakes can permanently brick due to locked bootloader and missing factory flash files. Firmware TCL 20E
This is the safest method for most users. It installs the latest official patches directly from TCL's servers. Have you tried to root your device or