In case I would like to downgrade Xcode, that is not possible using MacOS 15.1, as it requires a newer Xcode. For that I need to downgrade also to macOS 14, which is not that easy and risky. Additional, need to downgrade phones and devices, which are currently on 18.1.
So in the end, a lot of effort for a silly bug that the Xcode can no longer detect attached devices. While Finder, iTunes and other applications all can see the attached devices and its content.
gwtvanderheijden
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Hi Claude, I do not know where in X-code you can de-register and register a device, but I disabled and enabled my device under my account in "Certificates, Identifiers & Profiles" part. Note that the device will be only removed once a year, so you can only disable and enable it. That neither did help.