If you're running the latest macOS, you can skip this step. Choose Account > Authorizations > Deauthorize This Computer. If you don't back up your data, it will disappear into the ether when you perform a factory reset. Creating a backup will protect your most valuable files. We can't overstate the importance of this step. Here are some things to consider doing before you reset your MacBook Air or MacBook Pro. These pointers will ensure that you don't lose any personal files, photos or apps when you move from one MacBook to another. I would like to add I have not been able to install linux either onto my Mac, and not even rEFInd.The guide above is focused on resetting your MacBook, but there are recommended actions to take before factory resetting your MacBook that you should be aware of. I do have access to a few decently sized USB drives and a tri boot Windows/Linux/MacOS computer, but no professional tools. Is it even possible for a genius bar person to fix the software? How could I fix this myself? I have no idea what to do anymore, and would rather not go to an apple store to fix this. After using disk drill to flash MacOS to a USB, I tried using a disk utility option Convert to APFS., but that threw an error. Regarding the inability to boot the MacOS USB stick, I've read that the newer macs can only boot from APFS drives. I tried to reset the mac to its original OS after that with Shift+ Option+ Command+ R, but after loading with a rotating earth for a few minutes I get an exclamation mark sign over that earth with the following below it: /support I booted that and got the same A software update is required to use this startup disk error in recovery. I then completely wiped the internal SSD, and using another mac and disk drill made a bootable USB with MacOS 10.15.3. I ended up getting A software update is required to use this startup disk error in recovery. I salvaged all my data in recovery mode and tried to reinstall MacOS from there. After an update to MacOS Catalina 10.15.3, my mac would stay at the bootup screen with an apple logo. My System Integrity Protection is off, and T2 security is set to None.
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