CHINESE MODELS:
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