: Once the code is accepted, your device will be permanently unlocked. Safety and Troubleshooting

: Dial *#899# to open the factory test menu. Technicians use this to verify internal hardware without needing external diagnostic software.

: Open your phone's dialer and enter the code *#3988691# .

For those looking to unlock an Oppo device, the most reliable and secure method is using an official unlock code rather than third-party tools that may contain malware or damage your device's firmware. Official Unlocking Procedure

Oppo-network-unlock-tool-v-1-0-full-free-download-my-blog -

: Once the code is accepted, your device will be permanently unlocked. Safety and Troubleshooting

: Dial *#899# to open the factory test menu. Technicians use this to verify internal hardware without needing external diagnostic software.

: Open your phone's dialer and enter the code *#3988691# .

For those looking to unlock an Oppo device, the most reliable and secure method is using an official unlock code rather than third-party tools that may contain malware or damage your device's firmware. Official Unlocking Procedure