Default user code : 1122 , 3344 , 1234 , 5678
Engineer mode : *#110 *01#
Factory mode : *#987#
Enable COM port : *#110 *01 # -> Device -> Set UART – > PS Config -> UART1 / 115200
Restore factory settings : *#987 *99#
LCD contrast : *#369#
software version : *#800#
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