Did you actually do anything which may have caused the boot loop? If so, googling may find a procedure to reverse the issue.
Otherwise, it may be a bit drastic, but have you considered trying Kubrick? You will, of course, lose all your books and settings, and if Amazon have issued a replacement you may find that even if you fix your Kindle it has been blacklisted and won't connect to your account. Of course, if you have a computer with Calibre and non-DRM infested backups of your books this may not be a problem.
Good luck.
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