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If not jailbroken before that update to an user fw >= 5.8.8 (like yours): No chance.
The 5.8.10.0.1 discussed here is a special case: An "out-of-the-box" fw, not an user update. The latter definitively destroys the ability to downgrade. So the very first thing to do with a brand new Kindle is to leave it away from any Wifi network and then add the OTA blocker directory update.bin.tmp.partial to the root of the user storage before connecting the device to the internet.
Last edited by Antinoos; 01-05-2018 at 09:43 AM.
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