Xcode 12 4 Unsupported OS version after iPhone iOS update 14 7

Question

After updating iPhone iOS version to 14.7+, Xcode 12.4 can no longer build to that iPhone device.

In Xcode when choosing a Build Destination (Product > Destination > [device] or from the UI dropdown shown below) the newly updated iPhone will have beside it (unsupported OS version):

iPhone listed with "(unsupported OS version)".

Can't Upgrade to Big Sur / Xcode 12.5

I'm stuck on Mac OS Catalina (old hardware) and cannot upgrade to Xcode 12.5 which requires Big Sur.

How can we add/update device support to Xcode to build to an unsupported iPhone version (iOS 14.7+)?

 

Answer 1

This might be a temporary solution but here is what worked for me:

• Go into contents/Developer/platform/iPhoneOS. 
• Copy your previous iOS 14.5 the device support file or older version.
• Paste into the same folder and change the iOS number to 14.6.
• Restart Xcode, and it should let you run your code on your phone.