If you cannot find a dedicated Custom ROM ZIP file specifically built for the "1610," your best hope is a .

Before diving into the technicalities, let’s address the "why." The stock Funtouch OS on the Vivo Y51L is notorious for:

Over the years, developers in forums like XDA-Developers, 4PDA, and Telegram groups have found exploits. The most common methods include:

The community discovered that certain leaked DA files for the MT6755 could bypass the secure boot handshake. This allows writing a (little kernel / bootloader). Once you flash a patched lk.bin, fastboot oem unlock actually responds.

If you have successfully unlocked the bootloader, the general procedure follows these steps: