Q: iPhone 6 issue Please help

Hey i have an iphone 6 handed down from my mother.
It wont turn on (it says connect to iTunes) when i do it says it needs to be updated or restored... I need to restore it.
But when i restore it, it gets about halfway before it says error, 'cant find device' or a different error, where is needs to be updated to be restored. But it wont update due to another error, I think i was error code 34 or something.... Please Help