1.default user code: 1122, 3344,
1234,
5678 2.Engineer mode:
*#
110*01# 3.Factory mode: *#
987# 4.Enable COM
port: *#
110*01#

->Device ->Set
UART ->PS Config
->UART1/115200
1.Restore
factory settings:
*#
987*99# 2.LCD contrast: *#
369# 3. software
version: *#800# 4. software
version: *#900# 5.set default
language:
*# 0000#Send set
English language:
*#
0044#send