upgrading iMac 2010 from 10.6 to High Sierra

Banzai_Joe

Banzai_Joe

Banzai_Joe

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Joined
30 Sep 2006
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Midlands, UK
Hi,
so, here's the deal.
Trying to upgrade a friends 2010 iMac running MacOs 10.6.
It can go up to High Sierra for sure (i've checked on Apples website), but getting it there seems harder that swimming to the moon.
I have a MBP running Catalina. I've downloaded installers before and successfully installed various MacOS'es onto other Macs but none as old as this one. It seems that 10.6 is the sticking point as 10.7 is actually a different/new OS and is what's required for pretty much any upgrade. When i plug in the High Sierra bootable disk created on my MBP to the iMac it mounts but won't show as a bootable device, so i can't then boot from it and install onto the main disk (which can be wiped if necessary).
It looks like you are supposed to buy Mountain Lion disks, but i'm not sure.
Really didn't think it would be hard to resolve.

Any ideas would be most appreciated.

Cheers
 
Thanks bremen, i took a look, but it seems more for people who want to almost jailbreak their macs. I just want a bona fide and hassle free method of getting it up and running for my friend without risking of something fall over inside it.
 
I’d love to not be having these issues, but ‍♂️
I’ve only ever used Diskmaker, various versions to create specific MacOS versions.

I’ve tried it with Diskmaker making a High Sierra install and when I inserted the USB into the iMac and ran it it said it was damaged or corrupt.
So I downloaded it created the installer again and got the same error.

So I should be able to use my Mojave’s MBP to create a bootable USB drive with Hign Sierra on it using DISK CREATOR?
 
Oh fgs, this is doing my head in.
So, downloaded High Sierra installer (again).
downloaded Disk Creator. Ran it, chose the 16gb USB (different to the other USB i tried and failed with) that's connected to the MBP (via USB-C adaptor). Chose the HS image. It informed me it was going to erase the USB which i agreed to, then within seconds it comes up with an error saying it couldn't unmount the USB drive and to try re-inserting it or rebooting.
I've done both and get the same error.Why on earth is this so flippin hard????
 
I’ve not read through the entire thread but I’ve always made a bootable installer from
Terminal. Have you tried that?
 
Banzai_Joe said:
Oh fgs, this is doing my head in.
So, downloaded High Sierra installer (again).
downloaded Disk Creator. Ran it, chose the 16gb USB (different to the other USB i tried and failed with) that's connected to the MBP (via USB-C adaptor). Chose the HS image. It informed me it was going to erase the USB which i agreed to, then within seconds it comes up with an error saying it couldn't unmount the USB drive and to try re-inserting it or rebooting.
I've done both and get the same error.Why on earth is this so flippin hard????
Click to expand...


Silly question, is it giving you the same error if you try wipe and partition in disk utility?
 
Wouldn’t know how from terminal.
Turns out I got the error AFTER my MBP updated itself to 10.15.6.
It didn’t error the one time I tried prior to the update, but the high Sierra download I had was “allegedly” corrupt, so I downloaded a new one. Mac updated itself, tried creating new image and BOOM error!
F....M....L. !!!
 
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