Try to use my patched prelinkedkernel (this embedded telemetrap.kext , LegacyUSBInjector.kext, AppleHDA.kext and IO80211Family.kext, maybe also AAAMouSSE.kext ):
patched prelinkedkernel.zip beta1
And replace it here: /Volumes/UUID-BigSur/System/Library/PrelinkedKernels/
together with this
BigSur prelinkedkernel fix.zip
to copy here: /Volumes/UUID-BigSur/System/Library/
CoreServices/
At reboot you could have also Sound and Wifi.
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Here is my patched BootKernelExtensions.kc (this embedded telemetrap.kext , LegacyUSBInjector.kext, AppleHDA.kext and IO80211Family.kext, maybe also AAAMouSSE.kext ):
Patched BootKernelExtensions.kc beta1
For those who want to test it on their BigSur installation replace it here:
/Volumes/UUID-BigSur/
boot/System/Library/KernelCollections/
make a backup of your BootKernelExtensions.kc .
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Have you tried USBOpenCoreAPFSloader3 ? Because it works even with BigSur sealed system and snaphot booting enabled, anyway you should use my prelinkedkernel method, as also explained in this post.
I doubt that an automatic patcher will be released soon for any Mac without video acceleration (and legacy IOUSB), and when BigSur System is sealed with snapshot booting is even harder to make an automatic patcher.
An automatic patcher is only "easier" for "Catalina supported Mac" or eventually "HighSierra APFS supported Mac" with a Metal GPU upgrade and upgraded Broadcom Wifi 802.11ac .