This device costs about $30 on eBay and plugs into the USB port on your mac. The initial method of hacking EFI Firmware / iCloud Locked Macs is with a device called the Teensy.That gives us an ability to use unmodified Apple kernel. In simple words it allows to use original retail Apple installation disc because OS see our computer as original Apple computer. Empire EFI we are using to install Snow Leopard on our Toshiba emulates the EFI environment.MacVidCards now offers an EFI* Radeon RX 580 and EFI* upgrade services. AMD GPUs are macOS Mojave 'preferred,' but without Apple's EFI*, the power up process lacks a Startup screen and support for a Boot screen. August 1st, 2019 by rob-ART morgan, mad scientist. EFI Radeon RX 580 from MacVidCards in Mac Pro tower.
