Quote:
Originally Posted by matko
Despite my readings on this forum, I can not understand why only factory firmwares can be jailbreaked but not an updated firmware.
If this is a piece of software that Amazon adds in the updated firmware to prevent jailbreak, why not add it to factory one's too ?
What is the main technical cause that prevents to jailbreak updates firmware ?
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LAB126 calls it "Downgrade Protection".
The factory use only firmware builds have other differences.
It was added to the Kindle's public (consumer) firmware builds to block one of our jail break methods.
Why would they need or want to limit the factory's Q.C. division access to the hardware?
They would be better off preventing copies of the factory firmware builds from falling out of a back window of the factory.
Just the mailing cost from China is a lot to spend (none of this site's ad revenue ever shows up at this forum).
Keep in mind that these electronic devices require time to produce and in the case of a popular item, they must be produced in the 100,000s (sometimes, millions) before release to the public.
Considering that point, why do you find anything strange about having a firmware version built in time to begin using at the start of the production run and a different firmware version built in time to install after public release?
Keeping in mind that the two time points will be months apart, sometimes years apart.
If the above speculations are not enough of an answer, you will have to ask Amazon. We have nothing to do with the hardware and software development scheduling.
(We only screw with it after market.)