Go to Settings > About Phone > Tap Build number 7 times.
Unlike high-end phones that use fastboot, the TCL 30E (powered by the MediaTek Helio A22 or similar chipset) requires for a full manual firmware installation. Firmware TCL 30E
Installing firmware TCL 30E updates is a straightforward process. Here's how: Go to Settings > About Phone > Tap Build number 7 times
Open SP Flash Tool , go to the "Download" tab, and click "choose" next to "Scatter-loading File." Select the .txt scatter file from your firmware folder. Prepare Phone: Power off your device completely. go to the "Download" tab
Power off your phone and connect it to the PC via USB as prompted.
: These manual updates often require the SP Flash Tool and specific MediaTek (MT6765) drivers.