It's been a long time, but I have a K2. It was running the 2.5.8 firmware for a couple of years before the Critical Update was released. Just because the device is showing 2.5.8, that doesn't mean the Critical Update has been run.
Look here, make sure to notice the "Kindle Services Update" as that is the update you need to run.
There was a lot of confusion on the old Amazon forums when this update was released. Users would see 2.5.8 firmware, and not install the actual update that was needed.
Adding...CS used to tell you if a device you were trying to register had been blacklisted because of being reported lost/stolen. I've no idea if they will still do that.
Last edited by Deskisamess; 02-15-2018 at 10:35 AM.
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