Update is required to activate iphone
I have an iPhone 7 Plus and it keeps saying "An update is required to activate your iPhone". The only option I get from the screen is to come here or shut down the iPhone. The only suggestions on the support page is to update through mac/windows. When I connect my iPhone to my Mac it says "The iPhone “iPhone” cannot be synced. The operation timed out.". What do I do from here? I've tried 3 different sims and it doesn't work. All my devices are up to date.
iPhone 7 Plus