- 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
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