Help Can't update m8s+ box; buy new box?


I have an android box that was bought a couple of years ago, probably sometime in 2015. Similar to this one:

The new kodi doesn't work on it anymore, and I can't figure out how to update the firmware from 4.4.2 to 5.1. Did some search on the internet, but some people say it works, some say it doesn't, and the consensus seems to be that no one knows which file works with which m8s+ box.

So I'm considering buying a new box. Want a decent box that's easy to update unlike the one I'm holding. I really want it to watch HBO shows.

If you can help me update my firmware, or suggest a new box, that would be great. Any help would be appreciated. Thanks

PS. Here's my Box's system info: