Ok, My firmware version is 5.3.1.
It back to normal after I reset it to factory setting and redo jailbreak and install usbnetwork and copy developer.keystore.
I don't have any clue what happen here, one thing I noticed is very slow popup menu,
It take almost 10 secs popup the setting menu, but cause I can not log in via ssh, so no idea what happen in my kindle.
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