Malheureusement aujourd’hui il ne sert plus à rien de créer une clé bootable pour MacOS X 10.11 El Capitan, les serveurs Apple refusant de valider les paquets à l’installation…=> on se retrouve avec une brique inerte en guise de Mac !

Good guide ! less than 20 minutes to change the battery, cleaning the interior included !!

Same as the other comments, in my iMac 27” retina 2015, the WiFi/Bluetooth board is a bit longer and the 4 coax cables are fixed by 2 T5 screws…

In my iMac 27” retina 2015 all screws are T8.

There is also an another T8 screw between the left and central “orange” on bottom of the CPU board