[knc1]

Everybody is correct to a certain extent.

There is one part of the Kindle system (the majority of it) that is completely replaced by an Amazon update.
That includes over-writing our signature certificate (a.k.a: the "jail break").

There are two parts of the Kindle system that is not disturbed by an image update, they are:
The user's local data (which the user can not see).
The user's local documents (which the user can see over USB).

We include in the user's local data, the files required to replace (re-jailbreak?) the newly installed Amazon image by restoring our signature certificate.

Selecting "(Factory) Reset" erases all of the user's local files.
That includes the files required to restore the signature certificate after an Amazon update.

Then installing an Amazon update over-writes the signature certificate (a.k.a: the jail break).

= = = = =

Why did I write "never again use the reset function" ?

a) Because the object of this thread is to jail break the Kindle.

b) And an unwritten object of this thread is to keep it jail broken.
That is just assumed, that since the user went to a lot of trouble to do it, they want to keep it.
(and in step #7, the user will over-write the signature certificate, which will then need to be auto-replaced.)

Selecting the "Reset" function erases everything required to keep the device jail broken across Amazon updates. That is, "Reset" undoes (b) above.
People are told while doing (a) not to erase those things needed for (b), ever.

= = = =

Now people should be able to understand why it takes from 3 months to over a year to devise one of these jail break procedures. It is a complex undertaking.