default user code: 1122, 3344, 1234, 5678

Engineer mode: *#110*01#

Factory mode: *#987#

Enable test mode 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#

*#0000# call or *#0044# call Default English

*#0086# call or *#0886# call set to China

*#0084# call or *#0966# call set to Vietnamese

CODE moden 2007

*#8375# Examines the edition

*#8882# Software edition

*#87# Test

*#8899# Debugging

*#3646633# Factory instruction , ch?nh mic..

*#035670766*001#

*#035670766*002#

Looked in ida full gm208, gave out much in all imagining they interest the codes of *#...#, that each of them it gives

*23157714*#

*23177726*#

*28760404*#

everything else so through *,,*#

*32914149*#

*28885382*#

*90128572*#

*90173322*#

*33532955*#

and finally * 1222 *. # ( where. - 0,1,2,3)