If customization is essential, sell your Oppo A16 and buy:
Go back to > Additional Settings (or System Settings) > Developer Options . Toggle on USB Debugging and OEM Unlocking . Step 2: Unlocking via MTKClient (Unofficial Method) Unlock Bootloader Oppo A16
Unlike Google Pixel or OnePlus devices, unlocking the bootloader on an Oppo smartphone (including the A16) is notoriously difficult. In this long-form guide, we will cover everything: what a bootloader is, why Oppo locks it, the official (and largely unavailable) method, community workarounds, and the risks involved. If customization is essential, sell your Oppo A16
Since official methods fail, the Android modding community has developed unofficial tools that exploit vulnerabilities in MediaTek’s preloader and boot ROM (BROM). For the Oppo A16, the most promising tool is (MediaTK Client). If customization is essential