Some XDA / 4PDA developers have backported Android 9 Go to MT6580 devices (e.g., Tecno, Infinix, Micromax). These ROMs are:
Officially: Not possible.
Unofficially (Custom ROMs): Possible but problematic. mt6580 firmware android 9 install
The MT6580 is a 32-bit Cortex-A7 chip from 2015–2016, designed for Android 6.0 (Marshmallow). Android 9 requires a 64-bit kernel and updated graphics drivers (OpenGL ES 3.x+), which MediaTek never released for this SoC. Some XDA / 4PDA developers have backported Android
This is the official tool for flashing MediaTek devices. Download it from a trusted source like the "SP Flash Tool Official" thread on XDA Developers. Avoid ad-ridden third-party mirrors. This is the official tool for flashing MediaTek devices
Even if installed, UI is slower than stock Android 6 because: