Keep holding until you see a "Software Updating" or "Upgrading" progress bar on the screen. The process can take 5–10 minutes. Do not turn off the power
Finding free firmware for the mainboard (commonly used in TCL and Thomson smart TVs) typically requires accessing specialized technician forums, as official manufacturer downloads for these boards are rarely public. Available Sources for Firmware & Dumps tpdrt2841pb772 firmware free
This often indicates a corrupted user partition. Try a "Wipe Data/Factory Reset" from the Android Recovery menu if you can access it by holding Power + Vol Up . Keep holding until you see a "Software Updating"