After upgrading to High Sierra, some of the previously working functions stopped working on my iMAC (21.5-inch, Mid 2011) / AirDrop, BlueTooth pairing to iPhone6 and some other devices. I don't remember the last OSX version with which everything worked. I wanted to prepare a bootable external HDD with three partitions (each for another OSX - Yosemite, El Capitan, Mavericks), or a flash drive with the same structure.
As I have High Sierra installed, it doesn't allow me to make any installation of any previous OSX. Partitioning the flash drive goes also to no success. It is finally refused by disk utility.
Any suggestion?
As I have High Sierra installed, it doesn't allow me to make any installation of any previous OSX. Partitioning the flash drive goes also to no success. It is finally refused by disk utility.
Any suggestion?