See
https://www.amazon.com/gp/help/custo...MQC26VQQMM8XSW
It's likely either out of date FW (earlier than 2.58) or certificates (see Kindle Services Update).
Or invalid. The Kindle DX should not have FW 3.3
Quote:
Kindle DX (2nd Generation)
2.5.8
Your serial number starts with B004 download this file.
After your device has fully updated, download and install the Kindle Services Update.
Your serial number starts with B005 download this file.
After your device has fully updated, download and install the Kindle Services Update.
Your serial number starts with B009 download this file.
After your device has fully updated, download and install the Kindle Services Update.
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