iPhone 5s 8.4 help

I've been trying to update my iPhone from 8.1 to 8.4 but it keeps giving me error 3194 or 17 again and again. I have to kick my iPhone out of recovery mode with help of Recboot every time. My iPhone 5s is jailbroken, and is not letting me update from the settings as well.

Any help what can be done to update it?
Thanks in advance. :)

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