My Fire HD 6 is running 5.3.1.1. It says that 5.3.3.0 is ready to install. I checked the text rendering and it looks fine. However, I haven't used the HD 6 in months, so I forgot how frigging slow it is. Press an app icon button, go fix dinner, eat dinner, wash dishes, come back and wait a while longer then eventually the app opens. Geez! No wonder it collects dust. I was going to charge it up, but quite frankly I don't think it is worth the effort or electricity. I think it is time I gift it to the trash can.