Not hard to understand why it flopped
It was overpriced, underpowered, underfeatured and running some funny OS called Fire OS. Some people might know Fire OS is a fork of Android but even they wouldn't see it as a good thing.
About the only unique about the phone was also those cameras on the front - five(!) in total, four of which were for some headtracking 3D effect that few apps bothered with. A lot of complexity and cost for a gimmick.