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Updating via split RAR files usually means the firmware is being sourced from third-party forums or unofficial repositories, as official TCL Support typically provides a single .img or .bin file for USB updates.
Insert the USB into the TV's USB port. Press and hold the physical power button on the TV while plugging it back in. Download TCL 48D2740 Firmware part4 rar
A "part 4" implies there are at least three other parts (part1.rar, part2.rar, etc.). You must download all parts to extract the final firmware file successfully; missing even one part will result in an error during extraction. Compatibility: Ensure the firmware is strictly for the Updating via split RAR files usually means the
model. Installing firmware for a different variant can "brick" your TV (making it unbootable). A "part 4" implies there are at least
Format a USB drive to FAT32 and copy the firmware file (often named Update.img or similar) to the root directory.
Release the button once the update screen appears. The process usually takes about 4 minutes and will restart the TV automatically. How to update the software on an Android TV - TCL Support
Turn off and unplug the TV from the power outlet.