What does the amber/green light at the switch do when you try to charge?
I've seen the battery fail quite suddenly on two of these. The battery (really a cell) is easily replaced. The K3 won't start even on charger if the battery dies.
The registration for a K3 is possible, but you need a code via SMS or email. There is a thread on it here somewhere.
It might not be actually blacklisted.
Also originally the K3 did not support PDF, a FW update adds it.
Quote:
Kindle Keyboard (3rd Generation)
3.4.3
Your serial number starts with B008 download this file.
Your serial number starts with B006 download this file.
Your serial number starts with B00A download this file.
Note: If your device is on a version older than 3.4.2, please visit Previous Software Updates for Kindle E-Reader for instructions.
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https://www.amazon.com/gp/help/custo...MQC26VQQMM8XSW
The most likely thing is that it needs a replacement battery.