Before downloading any file, you must distinguish between official and unofficial software:
Recommendation: Always stick to official TCL 30 XL 4G firmware unless you are an advanced developer. Firmware TCL 30 XL 4G
Before flashing any new Firmware TCL 30 XL 4G, you should backup the NVRAM partition. This contains your IMEI, Wi-Fi MAC address, and Bluetooth address. Before downloading any file, you must distinguish between
Using SP Flash Tool:
SP Flash Tool (Smart Phone Flash Tool) is MediaTek’s low-level flashing utility, usable even on a bricked device. Recommendation: Always stick to official TCL 30 XL