– 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