Thank you for your reply.
yes , i could enter the recovery menu by hoding the enter key when start up.
there's no hardware problem, it's a soft problem.
i think it may be caused by the following soft:
1.launchpad
2.the chinese input method.
because only these two has related to the key-maps or key-listners.
now I have to reflash or repair the rootfs.
so i copied the firmware 3.1 to kindle, and press U in the recovery menu, but is not work.
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