"An update is required to activate your iPhone"

I did fixed it... Ic replacement is required. Power management ic of baseband ic should be replaced with new one.you need hot air gun and pmd 9645 ic for Qualcomm modem or pmb6826 ic for Intel modem. If you check it carefully you can find the name in the motherboard which modem your motherboard based on.

Try to reball the baseband ic. Maybe it will work. The pmic replacement was done in iphone 7 later models. Above models of iphone this issue will be cleared by Baseband ic reball enough i think. Try it. Try it in your own risk. Without baseband ic, still the phone will boot. So don't worry about it.. If you sucessfully and place it. Network will show up. Is the imei no showing up in first page when clicking the (i) button?or try to find a new motherboard, iphone 5s logic board is cheap. You can find online. Have a nice day

Logic board comes with fingerprint.. Swap it... Good to go... From the image which you uploaded shows all other components are working pretty well. Just change the logic board, your warranty should be void by now.

did you try this: Update your carrier settings on your iPhone or iPad - Apple Support

you should take it here: Store List - Apple Store - Apple

mine too, pls help huhu it is iphone5s

Remove your SIM card and replace it again worked for me

Have you found a solution to this problem?.

im having the same problem

No I have not and now it says no internet connection when I have one so frustrating

Hi Did you got this problem solved as I’ve the same for my iPhone 5s after I reset me phone

Did you ever find a solution to this Problem?

This is the screen I have...it's after a restore/update. I begin setup, pick the country, select wifi/connect to itunes, and this is the screen that comes up

Did you actually take yours to apple tech? We’re they able to fix it?