| Issue | Solution | | :--- | :--- | | | Restore your NVRAM backup using Maui Meta. If lost, re-flash the modem file from the ROM zip. | | Fingerprint sensor not working | Go to Settings > Fingerprint > Delete all prints. Reboot and re-register. | | VoLTE missing | Dial *#800# to enter engineer mode. Enable VoLTE in “Telephony” settings. | | Camera app crashes in portrait mode | Clear cache for the Camera app. Use a third-party GCam mod for better stability. |

Official over-the-air (OTA) updates from Oppo may be disabled or could potentially "brick" the device if they overwrite the custom Global ROM. Review: Go to product viewer dialog for this item. (2017–2018 Hardware)

Oppo R11st is a carrier-specific variant (typically for China Mobile) of the Oppo R11. Finding an "exclusive global ROM" for this specific model is difficult because Oppo generally does not release official global firmware for "t" (carrier) variants, and the R11 series has a locked bootloader that makes installing custom ROMs challenging.

: You will likely lose the ability to update the phone via official channels.