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@jacklukem jacklukem released this 15 Jul 09:21
· 104 commits to master since this release
3.1
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This version is updated and based on previous USBOpenCoreAPFSloader3 but optimized for unsupported Big Sur mac, specifically it allows to boot a BigSur Installation (either internal and USB external) from any Penryn Core2Duo non-APFS or APFS mac (also Sandy Bridge and Ivy Bridge Mac) and added some additional useful fixes for Big Sur beta:

  • Syncretic AAAMouSSE.kext and telemetrap.kext (for SSE4.2 and AVX emulation and to block the com.apple.telemetry.plugin)
  • parrotgeek1 LegacyUSBInjector.kext (to allow any legacy USB on BigSur also for non-APFS mac)
  • ASentientBot nvenet.kext (for use Ethernet on Nvidia Chipset based Mac)
  • preset nvram csr-active-config=w%08%00%00 (that is an already disabled "csrutil authenticated-root")
  • preset nvram boot-args="-no_compat_check amfi_get_out_of_my_way=1"
  • used as default bootloader OpenCanopy (similar to the apple startup manager with VolumeIcon support)
  • allows to continue a BigSur stage2 installer from a non-APFS mac (simply selecting the "macOS Installer")
  • blocks EFI SMC firmware updates when spoofing to a supported mac
  • apple startup key combinations available at opencore menu (CMD+S , CMD+V and so on)
  • used "prelinkedkernel" as default kernelcache for BigSur

for non-APFS or legacy USB the USB BigSur Installer (or its Recovery) is bootable but not usable due to legacy usb limitation on BootKernelExtensions.kc , so to install BigSur on non-APFS (or legacy usb) mac use this method:
https://forums.macrumors.com/threads/macos-11-big-sur-on-unsupported-macs-thread.2242172/post-28662873

fixed also USB BigSur Installer for legacy USB Mac: https://forums.macrumors.com/threads/macos-11-big-sur-on-unsupported-macs-thread.2242172/post-28737950

For more details:
https://forums.macrumors.com/threads/macos-11-big-sur-on-unsupported-macs-thread.2242172/post-28675922

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