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
