- Basesystem dmg full#
- Basesystem dmg verification#
- Basesystem dmg Pc#
- Basesystem dmg series#
- Basesystem dmg download#
If your PC is notebook and Haswell or newer: SSDT-EC-USBX-LAPTOP.aml If your PC is desktop and Haswell or newer: SSDT-EC-USBX-DESKTOP.aml If your PC is notebook and Broadwell or older: SSDT-EC-LAPTOP.aml If your PC is desktop and Broadwell or older: SSDT-EC-DESKTOP.aml If you have Intel WiFi use AirPortItlwm.kext, if you have Broadcom BCM94352 based card then you'll need AirportBrcmFixup.kext Most commonly used kexts are IntelMausi.kext, RealtekRTL8111.kext, AtherosE2200Ethernet.kext You need to identify it and use the corresponding kext. You'll also need a kext for your Ethernet network card if you're planning to use that as your network source.
Basesystem dmg download#
macrecovery.py (will download the macOS Recovery, right-click on “Raw”, “Save as…”)Ĭreate a new directory for the Recovery in the Downloads folder, for example “ Big_Sur_Recovery”ĭrag & Drop macrecovery.py to the cmd window.Python (needed to download macOS Recovery, select “Add Python to PATH” when installing).MiniTool Partition Wizard (to mount USB EFI).
Basesystem dmg full#
Important! On Windows you can’t create a full installer, only Internet Recovery, so you need live internet connection when installing Big Sur (either WiFi or Ethernet)įirst download (and install) the applications/files linked below:
When the internet recovery and diagnostic modes were added to Mac computers in 2011, it was decided that it would be better to use the simpler HTTP transport, and handle content authentication using the chunklist mechanism, rather than implement the more complicated HTTPS functionality in the UEFI firmware, and thus increase the firmwareʼs attack surface.Creating Clover macOS Big Sur Installer USB on Windows In the event that an individual chunk fails integrity verification, it is re-requested from the OS Recovery Server 11 times, before giving up and displaying an error. While the connection to the OS Recovery Server is done using HTTP, the complete downloaded contents are still integrity checked as previously described, and as such are protected against manipulation by an attacker with control of the network. (A user can also specifically request the images to be fetched from the internet using special key sequences held at boot.) The integrity validation of the disk images and chunklists downloaded from the OS Recovery Server is performed the same way as with images retrieved from a storage device. If an error has occurred in the launching of the local recovery or diagnostic environments, the UEFI firmware attempts to download the images from the internet instead.
Internet recoveryOS and diagnostic environment There’s no need for the UEFI firmware to do a specific check of the boot.efi, nor for the boot.efi to do a check of the kernel, because the completed contents of the operating system (of which these elements are only a subset) have already been integrity checked.
Basesystem dmg verification#
If the verification is successfully completed, the UEFI firmware mounts the BaseSystem.dmg as a RAM disk and launches the boot.efi file that’s in it. If any of these hashes don’t match, booting from the local recoveryOS is aborted and the UEFI firmware attempts to boot from Internet recoveryOS instead. This helps ensure that it matches the signed content present in the chunklist. The UEFI firmware evaluates the signature of the chunklist file and then evaluates the hash one chunk at a time from the BaseSystem.dmg.
Basesystem dmg series#
The chunklist is a series of hashes for 10 MB chunks of the BaseSystem.dmg. There is also an associated BaseSystem.chunklist, which is used to verify the integrity of the BaseSystem.dmg. The recoveryOS is completely separate from the main macOS, and the entire contents are stored in a disk image file named BaseSystem.dmg.
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