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Hi guys I wonder if somebody can assist me, I'm trying to reinstall sierra back onto my imac but I need to flash it from another device as internet recovery wont do it. It says I've downloaded it too many time. So I have a very old airmac and the trouble is that when I download the dmg it wont mount on the airmac as I fear it's too old. Would that be the case or is there something I can do to make this happen. Airmac is running osx 10.5.8...maybe I could upgrade the os on the airmac first but not sure what the latest is its capable of running any help would be HUGELY appreciated tia!