cannot update iphone

I keep getting this error message could not start a session with the iphone

I am running ios 7.1.2 on my iphone 5s

and i want to put 8....it just keeps saying extracting software and then i get that error message

i also cannot backup the iphone as well

i have the lastest itunes

any idea how to fix this and get ios 8????
brian ramdhaniCT Technician Asked:
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Sikhumbuzo NtsadaIT AdministrationCommented:
What error message do you get?

Can you post a screen shot, what PC flavour are you running?
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Stef95Commented:
Have you tried holding middle and power button together? and then trying to update the phone. Does it backup to the free 5GB of icloud you have if you have signed up?

Also when you connect your iphone to the pc can you update it through itunes?
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brian ramdhaniCT Technician Author Commented:
i ended up putting it in recovery mode and updated it that way....
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