These are macOS instructions on how to jailbreak your iPhone on iOS 14.3 using unc0ver. This procedure will work on all iPhones that support iOS 14.0 – 14.3, including the iPhone 12.
Step One
Backup your iPhone. This process should be safe; however, it's always a good idea to backup your device before attempting a jailbreak.
Step Two
Download the latest version of AltServer for macOS from here.

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