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–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#
–Software version : *#900#
–Set default language : *#0000# Send
–Set English language : *#0044# Send
–Set English language (new firmware) : *#001# Send
–Default user code : 1122, 3344, 1234, 5678

If you know any other codes then plz share here

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