Yup, that's what I just said. Since 5.4.2.1, you can't downgrade that way.
As or the rest: please, for the love of all that is holy, DO NOT, EVER, blindly follow instructions if you have no idea what they're for, and, worse, what they actually do.
In the same vein, don't install everything under the sun just because you can, or just because it's there.
TL;DR: the average Joe doesn't need 90% of what's mentioned in there. Just follow the JB instructions and its FAQ (which is designed to give you an idea of what you actually really need to install depending on what you want to do with your device, instead of just telling you to do stuff with no explanation).
As for the light: completely normal behaviour, nothing to do with the JB.
Last edited by NiLuJe; 04-19-2014 at 11:26 AM.
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