"pure" Android HD8 (8th gen) kids

Hi new to this forum but not xda.

I have two Fire kids tablets. Since the OS is the worst piece of crap I have ever used, I want to flush everything and get standard Android.

Can anyone point in the right direction? I see many threads about older versions.

I did a factory reset but it gets back with child profiles. I don't want any of that, just regular android.

It is 8th gen running 7.3.1.8

Thanks!