Use a FAT32-formatted USB flash drive (ideally 4GB or 8GB). Copy the firmware file (often named allupgrade_5522_8G_1G.bin or similar) to the root directory of the drive—do not put it inside a folder. Installation Process: Power off the TV and unplug it from the wall. Insert the USB drive into the TV's USB port.
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Because this involves high-voltage components on a "3-in-1" board, manual installation is recommended for those with electronics technician experience. Use a FAT32-formatted USB flash drive (ideally 4GB or 8GB)
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Wait until the process completes (usually 3–5 minutes) before removing the USB or turning the TV back on. Critical Safety Warnings