Here's a link to an Apple support article for specifically a 2018 Macbook Pro: Here's a link to the article I used that shows them all: I know it's frowned upon to include links without details, but booting into DFU mode is different depending on which mac you have. Boot the problem computer into "DFU Mode" by doing their convoluted key combo sequence during boot, and then after selecting the DFU machine in Configurator, you can choose Actions - > Restore to begin the process. This is done using the Configurator 2 app on the host computer connected to the problem computer using a USB-C cable connected to a specific USB port. I ended up discovering that I could revive/restore the Apple T2 firmware as well using a second mac "host".
Reinstalling the original OS so I could run the Big Sur installer from there instead (High Sierra would install fine but Big Sur would continue to give the "software update is required" message upon reboot).Using a dedicated USB-C drive instead of going through a dongle.I got this message, but the system seemed to crash at some point after clicking update and it wouldn't ever get past this. I solved this by doing the steps in the "TLDR" section above. I couldn't update choosing this option, I was stuck on the "try again screen". I tried to install my new macOS Big Sur but I faced this same message "A software update is required to use this startup disk". I also partitioned my HD to install the other MacOS version of the mac but this is not relevant.Īfter creating this booable USB, I restarted my PC and held the Option key so I could see my bootable USB in there. I wanted to have 2 different MacOS versions on my computer, so I created a Bootable USB with BigSur Installer (did all of this on my Catalina OS).
Doing this when the "it is necessary to make an update" screen appears and the computer will download the updates, make the update, automatically reboot, and you will be able to proceed with the installation without any problems. TLDR On the "Startup Disk Selection Screen", that appears after holding Option, connect a wifi network by searching for yours on the dropdown list). I faced this problem yesterday (and I solved it), here's the context:
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