If you can, ask Amazon support. It's the easiest way by far for all of us here.
Otherwise:
- if you had yifanlu's replacement kernel installed, you'd probably know anyway how to get out of this, so you probably hadn't.
- thus: you need serial console to get into export-all-partitions-via-USB mode
- you will need to recover the export password for this. instructions are here in the forums.
- you will need a root partition image for your kind of kindle.
- you will need knowledge on how to dump that image to the USB exported root partition
All steps have been done before, questions on them have been answered here in the forums, so you should be able to find answers here. I think you should ask yourself if you're able to do those steps and then start with the most complicated part, which would be serial console access (from my perspective, since it involves custom made hardware).
Carefully read up on each step. Check twice before doing something. Ask specific questions when they arise.
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