V4.10.0 was released as stable on September 16. However, it is still not available in the Amazon Appstore.
22 days ago I posted in the Beta Community that I was not able to run the latest betas on my Fire TV Cubes (Gen 3) and it would be nice to see v4.10.0 released, and Jagrim responded that Amazon is not quick in approving new releases. However, now I wonder if the reason that Amazon is not approving v4.10.0 is because it will not run on Fire TV Cubes?
v4.9.4 is getting a bit old and there have been some good improvements in the betas. I was able to extract an APK file for v2026.09.14.1459 from a Firestick that I had not updated yet, and that version was released only two days before v4.10.0, so I have a good workaround for now. However, it would be nice to see a new beta that runs on my Cubes, and hopefully that version could be submitted to Amazon and make it to the Appstore. By the way, all the v4.10.0 betas have worked fine on my Firestick 4K Max Gen 2 sticks.