: Use a thumb drive formatted to FAT32 . Extract the downloaded files (like upgrade_loader.pkg ) and place them in the root directory—do not put them in a folder. The "Force Flash" Method : Turn off and unplug the TV.

If the TV doesn't recognize the USB, try a different port or a smaller-capacity USB drive (under 16GB). If you've successfully flashed the firmware and the screen remains black, it may be a hardware issue, such as a failed EEPROM or mainboard component. Fix Hisense TV Firmware Update Issues | Q&A - JustAnswer

Headline: How to Revive Your Hisense LTDN42K320 : A Guide to Manual Firmware Updates

Is your Hisense TV stuck on the logo screen or constantly rebooting? You aren't alone. Many owners of older models like the LTDN42K320

mainboard), it is highly recommended to use the official Hisense Firmware Download Page . Third-party .rar files from unofficial forums can be unreliable or lead to corrupted installations.