[blaser]

Originally Posted by Quoth

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It's likely either out of date FW (earlier than 2.58) or certificates (see Kindle Services Update).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

mine starts with B009 and it is version 3.3
I think I followed these instructions, but it was many years ago and stopped in version 3.3
https://www.mobileread.com/forums/sh...d.php?t=263894

installed version 2.58 from backup, same problem of registering, I will find a different solution.