Not from this forum just came across your post. I have kindle fire running miui an older version. You do lose ability to watch amazon video if rooted and custom roms. Like another poster said, there is an app on market for reading books but alot of people complain its no where near as good as the stock reader. No there is NOT an external sd card so the other poster must be speaking of a different reader. I love my kindle and the fact that there is no way to hard brick it! Alot of people think its hard bricked, but the fire can be fixed no matter what error is there. Alot of roms for it, I've tried a few of but I just keep going back to miui. Sorry to hijack your post.