- 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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