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chinese user codes
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Default user code: 1122, 3344, 1234, 5678
Engineer mode: *#110*01#
Enable COM port: *#110*01# -> Device -> Set UART -> PS Config ->UART1/115200
Factory mode: *#987#
LCD contrast: *#369#
Restore factory settings: *#987*99#
Software version: *#800#
Software version: *#900#
Set default language: *#0000# Send
Set English language: *#0044# Send
Set English language (new firmware): *#001# Send
Se...
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