Create iPhone 6 iOS 12.4 simulator on Xcode 12.3

How can I create a simulator for an iPhone 6 (runninf iOS12.4) in Xcode 12.3? Entries in the Simulators list shown in Preferences->Components are all greyed out. The entries go up to iOS14.2. If I try to create a new Simulator by clicking + in Window->Devices and Simulators, Simulators tab, the only OS version available in the dropdown is iOS 14.3. If I try to download more Simulator runtimes I see the greyed out list shown in Preferences->Components.

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SimonKravis
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You can install additional Simulator runtimes in Xcode Preferences, or on the command line, by following this useful guide:

https://developer.apple.com/documentation/xcode/installing-additional-simulator-runtimes

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Developer Tools Engineer
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I cannot install from XCode Preferences as all the simulators listed are greyed out. Will command line installation be any different?

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SimonKravis
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Even though the options are greyed out, clicking on the download (down arrow) icon shows a screen "Xcode is trying to install Apple-provided software" and prompts of credentials to allow this. The simulator download then proceeds and the greyed out down arrow is eventually replaced by a blue tick, and simulators for devices using the downlooed iOS appear in options.

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SimonKravis
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This is typical Apple. Iphone 6 with iOS 12 is nowadays still supported by Apple (only iPhone 5* does not have support) but you do not have any way how to test it! Simulators support only newer devices! Thank you great Apple!

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AppleDevx
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