Phone disabled & itunes error 0xE8000015
So I've never synced my phone with itunes but I locked it (its a hand me down from my brother) and it says "iPhone is disabled connect to iTunes"
I installed itunes on a windows 10 laptop, connected my iphone but I get the error 0xE8000015
my computer knows its an iphone and everything is up to date
Does anyone know how I can unlock the phone/fix the error.
Note: the people at the phone store just said to connect it to itunes
iPhone 5, iOS 10.3.3, disabled iphone