6+HOLD+POWER   LCD pixel test
4+HOLD+POWER   Close Call test
5+HOLD+POWER   USB port test
7+HOLD+POWER   Load test data
1+7+POWER          Battery save test
3+HOLD+POWER   Display contrast
2+5+9+POWER      Firmware version
3+9+POWER          Scan test
6+LO+POWER       Boot mode for flashing firmware
3+0+POWER          Key touch test
2+7+POWER          Battery charge test
1+0+POWER          All memory clear