Flashing official TCL firmware does NOT void warranty. Flashing custom recovery (TWRP) or modified firmware does.
on a PC. This requires connecting the phone via USB and following on-screen prompts to "flash" the latest stock ROM. Software Upgrade - TCL Firmware TCL 20B
Firmware is the core software that bridges your hardware and its Android operating system, controlling everything from its 50MP camera to battery management. Keeping your firmware updated ensures better security, bug fixes, and improved performance. Key Specifications of the TCL 20B (Model 6159K) Flashing official TCL firmware does NOT void warranty