INTOSH

Upgrade / downgrade

Write the USB anywhere. Boot it on that Mac.

Pick the Mac and the macOS. Full installer writes OpenCore + Apple Recovery and stages OCLP. Tahoe Wi-Fi shows an icon but no networks until you run POST-INSTALL/finish.command on the desktop (plug iPhone USB for internet). Already installed? Use EFI only, then that same finish.command.

Target macOS

OS X 10.7–10.12

macOS 10.13–11

macOS 12–26 Tahoe

Intel Wi-Fi — pick one, never both

Works — Heliport in Recovery, next to Disk Utility

itlwm.kext in OpenCore. HeliPort.app in Apple Recovery, next to Disk Utility. Open HeliPort and join the locked 2.4 GHz WPA2-PSK name. Never load AirportItlwm at the same time.

Heliport selected. It is inside Recovery, next to Disk Utility. Do not also load AirportItlwm.

Apple model

MacBook Pro

MacBook Air

iMac / iMac Pro

Mac mini / Mac Pro

Apple silicon

nativeMacBook Air Early 2015 (11-inch / 13-inch) → Catalina

Catalina is native on MacBook Air Early 2015 (11-inch / 13-inch)

Early 2015 11-inch is MacBookAir7,1; 13-inch is 7,2. Same Broadwell HD 6000 + Broadcom Wi-Fi. Apple never sold an Early 2016 Air. Last native Monterey. Sequoia + OCLP has GPU. Tahoe: OCLP 3 nightly, no Metal.

  • Paste on any computer (Surface, Linux, Mac). Plug an 8 GB+ USB. Sudo password.
  • The writer’s hardware is ignored. This stick is built for MacBook Air Early 2015 (11-inch / 13-inch).
  • Option → EFI Boot → Macintosh HD. Never Recovery / Base System.
  • Tahoe Recovery Wi-Fi is a decoy (icon, no internet). Do not sit on that screen.
  • Desktop: USB POST-INSTALL/copy-efi.sh, then OCLP → Modern Wireless. Internet: iPhone USB hotspot.

Personal use on hardware you own. The paste writes a USB, it does not wipe the internal SSD by itself.