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Originally Posted by Ruskie_it
What a bummer... Ok, I suppose then that if one wants to retain the slightest chance that somebody some time in the future finds another security hole, he would do better not to update the factory firmware ever, right?
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That has always been true, that advice is frequently given, and seems to be seldom heeded. It has very often paid off, sometimes after a few months, and sometimes only after years.
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Or, in other words: has any of the jb found so far been valid for a kindle that had already been fw updated once?
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I'm not sure what you mean.
Some jailbreaks depend on an exact model and version. Those were sometimes the release version, but others times the version was after many updates. The last few years some jailbreaks would work for a range of firmwares on a range of models. I once had to do a firmware update to jailbreak, but that almost never happens. (And the firmware I had to update to was already old.)
In any case the newer firmwares are getting more and more locked down.