Manual flashing is typically used for "unbricking" a device or downgrading software. This requires specific "Stock ROM" files and flashing tools.
Select System Update and then tap Check for updates now . Firmware TCL 502
There are three primary ways to manage and install firmware on your device, ranging from simple wireless updates to advanced manual flashing. 1. Wireless Update (FOTA) Manual flashing is typically used for "unbricking" a