I am Trying to update my 4s to ios8 not working properly.. Any ideas?

My phone said it could do he ios8 uodate and now my phone will not work at all(Tells me to connect to itunes) tried to do a factory reset and so far still not working. I have been trying to fix this all day..

Try the update again. I received the invalid signature message when I updated to 10.5.1, but re-trying sorted it out. I might have had to re-start my computer, I can't remember now.

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