Which firmware version currently resides on your device?
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Originally Posted by MobileRead Wiki
Will this jail break work on my current firmware?
If the third field of your firmware version number: 5.8.7.0.1 is larger than 7 this jail break will not work on your device.
That means it will not work on: 5.8.8, 5.8.9, 5.8.10, ..., 5.8.99999999. (It's NOT possible at this time to downgrade and use this jailbreak)
Of course, this also means that it will not work on anything newer than the 5.8.x branch itself (i.e., 5.9.x, and whatever might come next).
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https://wiki.mobileread.com/wiki/5_x_Jailbreak