You have chosen the wrong firmware, likely the wrong LVDS Mapping or voltage (single vs dual channel).
The board is not recognizing the USB drive or the file. Fixes: Ensure the drive is formatted to FAT32. tsumv29lu firmware
Enter the factory service menu. On most universal boards, press Menu + 1147 or Input + 2580 on the remote control. Navigate to Panel Settings and toggle the LVDS TI Mode or Bit Depth until the picture clears up. 2. The Screen is Split, Mirror-Inverted, or Upside Down You have chosen the wrong firmware, likely the
Updating the firmware is often done to fix bugs, enable new features, or resolve compatibility issues. For the TSUMV29LU, there are two primary methods for programming the chip. Enter the factory service menu
Locate the 8-pin chip (usually an 8-pin SOP package like the 25Q32 or 25Q64 series) on the board.
The Ultimate Guide to TSUMV29LU Firmware: Download, Installation, and Troubleshooting