No radio, overheating chip. Diagnosis: Check the ART partition (offset 0x630000). If bytes 0-5 are not 0x020A0B0C0D0E , stop immediately. Solution: You need to extract the ART from your original bricked device (if you have a backup) or find a v09-specific donor.
If you can tell me these things, I can offer more specific advice on the update process. MIT-LCP/physionet-build - GitHub hktrt2861v09 firmware full
Insert the USB into the TV's USB port while it is unplugged. No radio, overheating chip