All detailed in my "KT2 Exposed" thread.
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Ah, so - after a few minutes thought -
Neither of you knew that you have, what we tag as a "KT2".
Which brings to mind another FGA:
Bet you didn't know how to find out either:
https://wiki.mobileread.com/wiki/Kindle_Serial_Numbers
Drat! Newbees!
On forum index page - find row of boxes.
In left-most box, select "KT2" -
Now click the right-most box "Show Threads"
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But to be fair, the 2014 prefixes where only activated in the past 24 hours.