Hello,, I just bought a new iMac 20,5" 2017 model. I portioned my disk so I could install Mac OS X Lion on the other one. I made a bootable flash disk (Using disk utility, carbon copy cloner,...) using different tutorial so I guess the flash disk is fine. When I try to boot up from the flash drive I get the grey crossed circle preventing me to launch Mac OS X Lion installation. Would that method be impossible to do on these iMac models now ? I used to use this method in the past, so... If anyone can help, thanks !