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5.16.2? No, you will only need to reinstall hotfix from NiLuJe and then restart Kindle twice.
Anything higher than that? No, it won’t brick neither, but if you want to have JB again, you will need to emergency restore it first, then reinstall the hotfix.
On any case, if you want to keep JB, never do two firmware upgrades to 5.16.2+ OR two factory restores in a row, OR any combination of these two.
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