iPhone 7 unable to active

Tech 10/20/2018

after restore ios 12 iphone 7 "unable to active. An update is required to active your phone" good working sim card inserted but it Show "No Service"
Answers

REWA

11/08/2018

please connect the phone to your PC, and check whether it is work? If yes, the problem will be in the phone signal part. If not, there is carrier unlock, then check whether replace the motherboard, if it replaced, then re-proof the address of wifi and Bluetooth  

Susan

10/26/2018

It show that you need to update to active your iPhone. You can try to update the lastest iOS system to see. But you said restore iOS 12, you mean is you have update to iOS 12.0.1 and downgrade to iOS 12, Is it?
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