If this happened, there's a command you need to run in order to revert the drive to HFS+ so you can install Sierra or El Capitan on it.MacOS High Sierra introduces new core technologies that improve the most important functions of your Mac. On top of that - if your system is running JUST an SSD, the High Sierra upgrade converted your drive to APFS, which is a no-go for Sierra. You can't download and run the installation for Sierra within High Sierra and downgrade the OS. Unless you're booting to Internet Recovery or a USB installer for the older OS and wiping the drive, you're going to get the error about the OS being too old. So it looks like my only option is to set up Time Machine and go that route at some point.
I also saw on that MacRumors site that the update 10.13.4 supports eGPU's on the Thurderbolt 3 plug, which mine doesn't have because it's too old.
I found a walkthrough on how to do it, but I don't have Time Machine set up, so i woould have to do that first. I tried downgrading from High Sierra back to Sierra, but it won't let me because it says the file is too old. Lot of new AMD suppot but you do require Thunderbolt 3 hardware or a hackintosh.
Apple is funny about macOS installers being moved around.
You can zip a copy to archive it for further use if required but leave it zipped in applications. If you do down load a fresh Sierra installer then ensue that you remove the old one to the trash. Second option is to download a freah Sierra installer from App Store - it will be shown in your purchases and can be downloaded again. I tried downgrading from High Sierra back to Sierra, but it won't let me because it says the file is too old.Ĭhange the date in Preferences to just after the existing installer date to re validate it. If anything, ATS runs a little worse now. Raiden353님이 먼저 게시:I've gone through a couple of High Sierra updates, and nothing has helped honestly.