MacBook Pro (13-inch, 2018, Four Thunderbolt 3 ports).MacBook Pro (13-inch, 2019, Four Thunderbolt 3 ports).MacBook Pro (13-inch, 2019, Two Thunderbolt 3 ports).MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports).MacBook Pro (13-inch, 2020, Two Thunderbolt 3 ports).If you have an Apple T2 chip, it is likely you will not be able to boot from an external source (such as a USB) until you shut off a particular setting. Below this paragraph, I have listed each Mac that contains the T2 Chip. However, before starting this process, you need to determine whether or not your device has the Apple T2 Security Chip. Unfortunately, you’re more than likely going to need to erase the drive and start over. Knowing if you have the Apple T2 Security Chip will really help you through this process. How to Fix the Version of macOS on the Selected Disk Needs to be Reinstalled? I’ll also briefly go over some reasons why a Mac update may not install to disk. While some users may not like the answer, there is a solution in sight. I’m going to show a solution for those using both Intel- and Apple-based processors. Gathering this information together, I’m going to take a look at what a user needs to do if they’re having issues after receiving a “Selected disk needs to be reinstalled” error. While this may sound like an incredibly frustrating experience, there is something that you can do about it. Sounds easy, right? Well, what happens if you click another startup disk and nothing happens? Even worse, going to Recovery doesn’t solve your issue, either. It may also then go on to say “Use Recovery to reinstall macOS or select another startup disk”. ![]() When you turn it on, you see the message “The version of the macOS on the selected disk needs to be reinstalled”. Here’s a scenario you might find yourself in: say you get a used MacBook.
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