Before downloading any firmware, you must know your exact model number. The TCL 20E is generally identified as T607DL (common in the US) or T607 (International variants).
Typically, we will maintain the security updates for at least 2 years after the first shipment of a certain device model. Software Security - TCL Firmware TCL 20E
Firmware acts as the bridge between your phone's hardware and the Android OS. For the TCL 20E, official firmware is typically based on with the TCL UI overlay. Before downloading any firmware, you must know your
For the TCL 20E, the firmware manages: