"M" used in factory product.
"U" used in exit factory state,
Not all,the chassis that must support the satellite
signal for example: Europe TV :13V，18V，OFF；
Japan：15V
remember mode/Power on mode/standby mode
If the TV has the function of USB disk upgrade
directly in the factory menu then can use the item.
Led backlight driver upgrade
if the panel parameter of smart TV is not right then
can USB upgrade directly .
when choose "on" then can serial port connect
with Tool
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