I have a 2010 MP which is - wonder of wonders - actually running High Sierra because the only way i could install it was to upgrade from El Capitan which was previously on the HD. I then managed somehow to make another bootable SSD since the installer seemed to be still in the system. El Capitan is now gone and Safari won't download High Sierra any more.
What I have tried to do is clone the SDD drive with High Sierra on it. I've been trying to do this for a week, watched about 15 YT videos, tried all the methods they suggested and nothing worked, then downloaded Carbon Copy Cloner. I watched the YT tutorial and followed all the instructions. I got a SSD boot disc that started in Disk Utility and wouldn't boot normally with the message "can't run the OS off this disc". I then tried to reformat the SSD I'd used with CCC but disc utility seemed to load off some new version of Disc Utilities and wouldn't open. I took out the cloned disc and the Mac booted normally. So it now looks like I can't even reformat the new SSD. Yeah, great, so how do I erase that? So all attempts at cloning my present boot SSD have failed and I've wasted a whole week faffing around uselessly. Like many, many, many other 2010 Mac Pro users obviously from the amount of threads on this.
So the only thing left for me as far as I can see is to find an old HDD with El Capitan on it, or try and download it from the Apple store since it comes up in my list of purchases and start the whole bloody thing again. I want a bootable copy of High Sierra to upgrade my 2009 5.1 Mac Pro running Sierra. Which won't download High Sierra from the Apple store. I previously spent fruitless hours making a flash drive and copying code but all that failed too.
This is ridiculous. Can anybody suggest anything other than going back to El Capitan that actually works? Sorry, but after a week of all this my patience is gone. I love my 2 Mac Pros but Apple clearly doesn't.
What I have tried to do is clone the SDD drive with High Sierra on it. I've been trying to do this for a week, watched about 15 YT videos, tried all the methods they suggested and nothing worked, then downloaded Carbon Copy Cloner. I watched the YT tutorial and followed all the instructions. I got a SSD boot disc that started in Disk Utility and wouldn't boot normally with the message "can't run the OS off this disc". I then tried to reformat the SSD I'd used with CCC but disc utility seemed to load off some new version of Disc Utilities and wouldn't open. I took out the cloned disc and the Mac booted normally. So it now looks like I can't even reformat the new SSD. Yeah, great, so how do I erase that? So all attempts at cloning my present boot SSD have failed and I've wasted a whole week faffing around uselessly. Like many, many, many other 2010 Mac Pro users obviously from the amount of threads on this.
So the only thing left for me as far as I can see is to find an old HDD with El Capitan on it, or try and download it from the Apple store since it comes up in my list of purchases and start the whole bloody thing again. I want a bootable copy of High Sierra to upgrade my 2009 5.1 Mac Pro running Sierra. Which won't download High Sierra from the Apple store. I previously spent fruitless hours making a flash drive and copying code but all that failed too.
This is ridiculous. Can anybody suggest anything other than going back to El Capitan that actually works? Sorry, but after a week of all this my patience is gone. I love my 2 Mac Pros but Apple clearly doesn't.