just for the record Amazon have advised the Fire 8 runs with “Fire OS 6.3.1.2 (NS6312/1857) - 2517057924” and the build is “Fire Tablet HD 8” . This is taken directly from their email. They say I can install “ by going to the Kaspersky website, login and follow instructions. “ However I’m not convinced this is the case. Thank you to Flood for replying to me.