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with the PW4 diag ,your KT4 uboot lost,so bricked,and also no uboot running infomation with USB to Serial adapter.
in the device manager ,if can find a new HID-compliant device ,
or you can try use mgftool to reload uboot on KT4.
that is the way to unbrick a kindle with uboot lost,even replace an new blank MMC chip.
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