You must search for unofficial "exploits" for the Snapdragon 425 to bypass Vivo's lock.
This is the hardest step.
| ROM Name | Android Version | Bugs | Stability | |----------|----------------|-------|------------| | LineageOS 14.1 | Android 7.1.2 | FM Radio, VoLTE (in some builds) | 90% | | AOSP Extended v4.6 | Android 7.1.2 | Camera flash sync | 85% | | Resurrection Remix 5.8.5 | Android 7.1.2 | Battery drain slightly higher | 80% | | Pixel Experience 8.1 (Go) | Android 8.1 | No video recording | 75% | | crDroid 3.8 | Android 8.1 | Bluetooth calls | 70% | vivo 1610 custom rom work