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Making it immutable is ugly, but, I don't think the system ever changes the file.
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Only every time Amazon or yourself installs a firmware update file.
These devices (since 5.1.something) use complete system images as the update.
Also the system still has a file manifest in the form of a list of file, md5sum values for what Amazon/Lab126 considers: "Critical" files.
The rescue pack (rp) installed along with its add-in (cowards rescue pack (crp) ) is (by design) tested very early in the start-up (and certainly before the manifest check although I don't recall if before X is started).
It would be a real good idea for anyone to consider how they are going to rescue or de-brick their Kindle (and maybe practice a bit) before changing system image files.