The TCL 30E runs on TCL UI (based on Android 11 or 12, depending on the variant), not stock Android. While TCL has improved its software over the years, the firmware on the 30E is a mixed bag—adequate for basic use but frustrating for power users.
What Is a Firmware Update and Why Is It Important | NinjaOne Firmware TCL 30E
Activate Developer Options: Go to Settings > About Phone > Tap Build number 7 times. Firmware Review: TCL 30E The TCL 30E runs
FOTA (Firmware-Over-The-Air): This is the most common method. The device checks for updates wirelessly from TCL servers. Path: Settings > System > System Update (or "Updates"). depending on the variant)