Quote:
Originally Posted by pavel-s
Hello,
Would it be possible to modify the factory firmware (e.g., version; or something else) in order to make the downgrade from 5.8.10 possible (with the ability to further upgrade after jailbreak)?
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No.
The determination of what package(s) is acceptable is made by the firmware currently running (5.8.10 in your example).
OR
No.
The update_*.bin name format packages are cryptographically signed (both ours and Amazon's) and only Amazon has Amazon's signing key. That prohibits changing any externally accessible package.
Amazon does have our key(s) but they do not include them in their system images.
(Putting our key into the Kindle system's keystore is what our "jail break" does.)