- Go to 'Settings > Gear info > About device'
- Tap five on 'Serial number'
- Enter a code of your choice
| Secret code | Description |
|---|---|
| *#0*# | Test mode |
| *#0228# | Battery info |
| *#0283# | Speaker loopback config |
| *#06# | S/N number QR code |
| *#0808# | USB UART config |
| *#1111# | FTA SW version info |
| *#1234# | AP/CSC version info |
| *#12580*369# | Extended version info |
| *#1679# | Pressure test |
| *#2222# | FTA HW version info |
| *#2663# | Touch firmware config |
| *#33842343# | Device ID creation |
| *#34971539# | Camera firmware config |
| *#7353# | Self test mode |
| *#9900# | Log dump |