One other thing you could try is see if you can enter a Diagnostics mode... this is nit the same as factory reset.
See pic for sequence of keys to press... if you can enter diagnostics then exit and see if you can do a reset
To exit simply press the power button
May not help but worth a shot....
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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