I was running my self-developed software on my iPhone 7 which runs iOS 12.2 when an alert had popped up:
This iPhone 7 (Model 1660, 1778, 1779, 1780) is r
For Xcode Version 10
Download 12.2 (16E226)
Copy 12.2 (16E226) directory to Applications ▸ Xcode.app ▸ Show package Contents ▸ Contents ▸ Developer ▸ Platforms ▸ iPhoneOS.platform ▸ DeviceSupport
Quit Xcode and open again.
=> Update for iOS 12.3 step 1 -> 2 copy folder 12.2 (16E226) and rename 12.3 -> 3