You can update your device through the system settings or by manually flashing the official package from the Vivo Support page Method 1: Standard System Update (Recommended)

Get the official firmware package from the official vivo support site.

Transfer the file to the phone's root directory and select it via the file manager to trigger an update. 3. Firmware Recovery and Restoration

: Based on Android 9 (Pie) with Funtouch OS 9.1 How to Update Your Vivo Y12i