You have blobs for those?
Redsn0w is the easiest
Neither does 6.01
I would go for 6.01 use sn0wbreeze to downgrade
For 5.1.1 use redsn0w
5.1.1 is just better, safari tabs do not lag, multitasking doesn't lag too, the lock sound is instantenyous and so on...
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OOO, you have 4s and 5, that's why you think 6.0.1 is better.