I want to update my Overmax tablet's Android version in any means! Is there any way?

I have an Overmax Solution 10 tablet, but sadly the manufacturer stopped supporting they own product long ago, and they didn't care.
It's running 4.1.1, and it's freezing all the time, i resetted, hard resetted, factory resetted, none of those worked. I would appretiate any kind of more fresh files, like firmware or anything, which would make this thing more stable. Thank you!