You won't find them on a central website like for OnePlus or Pixel devices. Search in these places:
LineageOS is the most popular choice for any MediaTek device. It focuses on stability and a "stock" Android feel. Minimal bloatware and high performance. Best for: Daily drivers who need a reliable phone. Key Feature: Privacy Guard for granular app permissions. 2. Resurrection Remix (The Feature King)
While official support for MT6735 has largely ceased, many "unofficial" builds for specific devices (like the Lenovo Vibe K5 or Meizu M2) are still hosted on the LineageOS Downloads page or community forums. 2. Resurrection Remix (RR)
In the world of Android, the MediaTek MT6735 holds a strange, almost legendary status. Released in 2015, this 64-bit Quad-Core Cortex-A53 processor was the workhorse of the budget smartphone era. It powered countless devices like the Lenovo Vibe K5, Samsung Galaxy J2, Xiaomi Redmi 2 Prime, and dozens of others.
Power users and gamers.