The unc0ver jailbreak has been updated to version 6.1.1 fixing an issue with Xcode debugging for those on iOS 14.0 – iOS 14.3.
What's New:
● Make Xcode debugging work on iOS 14 by patching an Apple bug that caused it to break after rebooting userspace
The unc0ver jailbreak works for all devices running iOS 14.0 – iOS 14.3, including the iPhone 12. You can find instructions on how to jailbreak your device here:

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