I bought my mom a Kindle Fire 8 HD for Mother's Day. I wanted to install google hangouts so she can make phone calls. I understand that I have to sideload apps. In order to download the correct version of these apps, I need to know exactly what version of android my Kindle Fire is running. I have no idea how to figure this out, except that on my device it says I'm running version Fire OS 5.1.2 which in no way tells me what main version of android it is configured to.