Do you have a (like a Minix or a generic tablet) that you are trying to update?

for free is technically challenging because this SoC (System on a Chip) is nearly a decade old and officially supports up to Android 4.4 or 5.1. While there is no "one-click" official free update, here is how you can approach finding and installing a custom version of Android 10. 1. Finding a Compatible Custom ROM

That being said, here are some possible sources for a free RK3188 Android 10 ROM: