[SOLVED] Installing Yosemite in 2020

Nov 2, 2019
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So heres the problem. My brother asked me if I could format his iMac 2008 model and since I dont know much about iMacs I went to google for a solution, I did format his drive but the problem is I cant leave Disk Utilities. So I googled again and it says that I just go look for the startup disk, but theres no startup disk available.

So I thought maybe when I formatted the iMac it included the startup disk(OS) for some reason. So I tried re-installing yosemite and it says that it is no longer available on apple store. Luckily theres google, I found a site for downloading Yosemite OS. So I created a bootable USB, but the problem is when I try booting through the USB, the USB does not appear for booting. Is there any more solutions for my problem?

PS. Sorry for my bad English.
 

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