I want to using Xcode11 to test apps on my iPhone 11 with iOS 15 installed, but currently seems the Xcode11 cannot identify the device. I don't want to install the latest Xcode 13 nor upgrade my macOS, is there any way to resolve this?
Thanks in advance for your help!
There may be hacks available, but generally speaking these will cause issues. The only approved way is to install the latest Xcode. If you need to keep Xcode 12 (due to bugs or other issues inside 13), you can have both installed on your machine at the same time without any extra software or hacky setups. MacOS only cares about unique application names. You can download both one by one and simply rename one or both of them in the applications folder.
Also Xcode 13 doesn't require the latest MacOS to run, they always support the latest and the previous MacOS. So you should be able to download that no problem (unless your MacOS is many years old which is a bad idea anyway).