KOA Serial Jailbreak Kindle Oasis 1 - Need help

Hi! After some experiments, I finally find out the serial port of Kindle Oasis 1 (Tx, Rx, and GND) as in the picture. :D
[IMG=853,400]https://www.mobileread.com/forums/attachment.php?attachmentid=181269&stc=1&d=1597236 967[/IMG]
I successfully access to uboot by connect with USB to TTL adapter.
But when I enter the code
to access diag mode, it stucks somewhere in loading kernel.


Could anyone have any idea? :help:

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