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Hi, to reset the problem signs or codes, key in the following in this order and a speed of a second per key press;
C Auto C Auto, display must go off or blank.
Enter desired code followed by Copy key press. Others have sub-codes and will require you to press Copy key again after that sub-code. For example H2,H3, U2 and H4 needs once Copy key press while developer or maintenance signs require pressing 20 then Copy key then 01 then Copy key.