Hi Guys, I've got a late 2008 Aluminum mac book that still runs like a champ. Aside from putting extra ram (8GB) and a SSD Drive into it, I've not modified it other than OS updates. I've read online that the spec *should* run Sierra fine and you can either get it on by either flashing the firmware or doing the guide run by 'dosdude1'. Is it possible to do a firmware update so you can simply update it via the app store? Many thanks!!!