If your TV cannot connect to the internet or you need to install a specific version (downgrade or repair), you can use a USB drive.
TCL rolls out OTA updates in phases. You may see “No update available” even if a newer firmware exists. Firmware TCL 32ES560
Use this method if your TV has no internet or is stuck on a boot loop. : Format a flash drive to FAT32 . If your TV cannot connect to the internet
What updates commonly change: