Hello! This is my first post on the list. I just upgraded the Mars. My first attempt gave me a great scare, because as a result I had obtained a brick. But it was because I had tried to install update 3.1.1 over Android 6.1. I contacted Technical Service and they resolved the situation for me. So I installed the update to OS 8.1 first and then the rest of the updates began to arrive quickly over the WiFi. Until I was able to manually reinstall the 3.1.1 update. And it has really improved in several respects. The most noticeable in my understanding has been the precision in the underlining and in the highlights. Also, the device is much faster and I was able to solve a problem that had previously when sending my highlights to Drive.
I use it for academic purposes and it is a very good tool. A nice complement to the Kindle Paperwhite. .
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