: You must first acquire an official SIMLOCK or REGLOCK code (often available through your carrier or verified unlock services like UnlockBoot ).
How to Run a Full Diagnostic Test on an Oppo Smartphone: All Methods oppo-network-unlock-tool-v-1-0-full-free-download-my-blog
: Dial *#899# to open the factory test menu. Technicians use this to verify internal hardware without needing external diagnostic software. : You must first acquire an official SIMLOCK