But Kindle Factory Reset won't fix problems; it just clears the userstore -- "/mnt/us/" on the Kindle or Kindle Drive ("E:\" on Windows, ususally,and "/media/Kindle/" on linux) on your computer -- and resets the registration. (It also deletes the MR certificates.)
Hacks will usually add all kinds of shortcuts to /usr/bin/ (pointing at the binaries in the userstore), for example, as well as potentially adding all kinds of junk. You can also use the kterm extension to pretty much do anything to the hidden system partition.
Kubrick will repair the changes that hacks made on the Kindle system by overwriting the main partition with a fresh copy of the default data. This is a must-have if anything important got deleted, or if you specifically wish for a factory-fresh filesystem.
I guess you can also apply a firmware update, but not all of them have a full system image (only the later Touch/PW ones, IIRC).
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