ro.cvte.MODEL_ID=CP506217_JPE_TP_HV553_PC821_JORDAN_HV550QUB_V10_SAMIX_01201911125_E55DM1100

Try changing the name of the firmware file to a generic layout like allupgrade553_1G_8G.bin if specified by your supplier. Move the USB drive to an alternate onboard USB port.

This information is invaluable for finding the exact factory firmware intended for your specific TV revision.

In simple terms, this is the software embedded into the television's mainboard. It is comparable to a smartphone's ROM or a computer's BIOS. It is responsible for initializing hardware components and booting the operating system.