Quote:
Originally Posted by zhangsiyan12134
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So I tried re-jailbreak through serial port, and those software still won't run.
That's where this question comes from. 
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It **should** re-install all parts of the jailbreak when you re-boot the device with the power button (held 20 seconds or more - ignore any pop-up panel).
If not, then give us details of what you did to "re-jailbreak" - include links to anything you used.
If KUAL and MrPI are still working (and they should be after a re-boot) -
You have to re-install all update_*.bin packaged files after an Amazon update.
That is normal.
MrPI can install all of the packages by putting them all into /mrpackages at the same time.