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
Default Passwords : 1122, 3344, 1234, 5678
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