If you are looking for specific ROMs or need assistance with a particular model, the XDA Developers MediaTek Forum is the best place to find support. If you are struggling with a specific step, let me know: What is the of your phone? Are you getting a specific error code in SP Flash Tool?
Ensure all partition checkboxes (Preloader, Recovery, System, Vendor, Userdata) are selected. mt6580 firmware android 9 install
Unofficially (Custom ROMs): Possible but problematic. If you are looking for specific ROMs or
The is a 32-bit ARM Cortex-A7 SoC (quad-core, max 1.3 GHz), with Mali-400 MP2 GPU. It was released in ~2015–2016, originally supporting Android 6.0 Marshmallow officially. max 1.3 GHz)
Your VCOM drivers are not installed correctly. Re-verify your Device Manager settings or try a different USB cable.