Can't update my trio?

I'm trying to update my Trio AXS tablet which is in 4.2.2 , but I'm trying to update it to version 5.0 or later but everytime I try it says it's up to date but I want to update anyway so I can get the latest Chrome because I accidentally just factory reset my tablet and now Chrome is all weird it's not the latest version at all and then I tried looking up solutions like syncing to the system but it's unable to sync now and I tried updating all the Google apps and it turns out every time I update Google Plus it's on compatible so I like to update the software please I don't know anything how to get the APK ROMs for version 5.0 or later versions and I seen people on YouTube done it. Please help.