\uD83E\uDD14 Problem
The display isnt reacting on RS232 commands anymore.
\uD83C\uDF31 Solution
When you updated the display over the air, you need to enable RS232 in the factory menu.
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access the debug menu by pressing following buttons on the remote: UP, UP, DOWN, DOWN, LEFT, RIGHT
or via the Android settings > About > click “build version” 10x in a row. -
Choose DEBUG
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Set RS232 enable <<ON>>
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Go back until you are out of the factory menu
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Reboot your device