The first link leads you to a test mode version: you can download just small areas files-
If you want to download bigger files tou must patch your firmware (second link) It disables most of the checks made by the JNX loader in the device too.
you should read all the instructions here
Code:
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as swritten in the thread
and
Code:
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some more infos about upgrading and downgrading here

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and others
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old firmwares here

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if something goes wrong
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