The development community has brought modern versions of Android to the A20, including:

While custom ROMs offer many benefits, there are risks involved:

Because the A20 uses an Exynos chipset, development support is decent but not as explosive as Snapdragon devices. Here are the top contenders:

After scanning XDA Developers forums and Telegram groups, these are the most stable and actively maintained A20 custom ROMs:

Essential for any custom installation; note that this often trips Knox and may void warranties.