If you have flashed the correct software but the TV continues to boot loop, or the software load consistently fails around 20% to 30%, you are likely dealing with a physical hardware limitation native to the Realtek platform.
: Keep holding the power button until the standby LED light begins flashing rapidly, indicating the system is processing the update. Release the button and wait 5 to 10 minutes for the progress bar on the screen to hit 100%. Do not disconnect power during this step. Troubleshooting a Broken Flash Sequence hktrt2831p738 firmware best
Watch the standby LED indicator light. Once it begins blinking rapidly (indicating it is reading the data), release the power button. If you have flashed the correct software but
: Place the install.img (or similar) into the root directory of the USB drive. Do not disconnect power during this step