Use a high-quality USB 2.0 flash drive (8GB or 16GB is ideal). It must be formatted to FAT32 . Step-by-Step USB Firmware Update Guide
Try a different USB port or a different brand of USB drive. Ensure the drive is FAT32 and the file name is correct. tpsk506spb802 firmware usb link
Search for the specific BIN file matching your board and panel on technician forums or official support pages. The file is usually named allupgrade_506.bin or similar. Use a high-quality USB 2