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Fire 3.5 is a forked version of Android 4.2.2. That means two things in particular: it won’t support the latest LE Bluetooth devices, and it doesn’t have all of Google software, including maps. You will need to either depend on Amazon’s app store, which is inferior to Google’s Play in terms of updating and number of apps, or I assume you can sideload apps. I haven’t had a chance to use Fire 3.5 in person, so a lot of my assumptions are based on the Kindle Fire and what I’ve read. Since it is an Android based OS, it will not run applications for iOS or Windows, obviously.