| Issue | Cause | Solution | |-------|-------|----------| | TV won’t recognize USB | Wrong format, file name, or USB port | Reformat FAT32; rename file exactly as required. | | Update fails at 50% | Corrupted file or incompatible model | Stop – TV may be bricked. | | TV turns on but black screen | Wrong firmware version | Requires hardware reflash (service center). | | No “Service USB” port | Model lacks update capability | No firmware update possible. |