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@wind06 and @madman1234 It appears indeed that it is a bug encountered by those who upgraded from Catalina to Big Sur in version 5126... https://github.com/CloverHackyColor/CloverBootloader/issues/300 It also seems that it is not possible to migrate directly to OC once passed in 5126 and Big...

Jumped into Big Sur without problem except I cannot download/update App Store applications anymore !! Anyone have any ideas? I tried to remove the App Store cache, but still not working...

It seems so : https://www.tonymacx86.com/threads/help-configuring-opencore-for-asrock-z490-i5-10400f-rx-5700-xt.300337/

Hello, Inexblicably, I have rebooted and no more error message (didn't even enter csrutil disable) !!

I have no nvram.plist in my EFI folder. It looks like I should try entering csrutil disable in order to have nvram - c working... I will try this tomorrow I have to sleep. Thank you very much for your great help :)

OK. Do you have any idea on how could I do this?

OK... Is there anything more I can do with this nvram?

Should I change my default loader from boot.efi to BOOTX64.efi in Clover configurator ? I am lost...

Still the same... :banghead:

Still the error after entering $sudo mount -uw / (OK) $sudo nvram -c nvram: Error clearing firmware variables: (iokit/common) not permitted Should I remove EmuVariable64.efi ? (like this thread) Thank you for your help ! :)

Done. Still the same "System uptime in nanoseconds". Also entered all the following commands : sudo rm -f /System/Library/Caches/com.apple.kext.caches/Startup/kernelcache sudo touch /System/Library/Extensions sudo kextcache -i / sudo nvram -c sudo purge sleep 1 And I still get the error...

Ok thanks then what files/folder should I remove ? $ ls -l /Volumes/EFI/EFI/CLOVER/drivers64UEFI/ -rwxrwxrwx@ 1 staff 17568 17 jan 2018 AppleImageCodec-64.efi -rwxrwxrwx@ 1 staff 5280 17 jan 2018 AppleKeyAggregator-64.efi -rwxrwxrwx@ 1 staff 2400 17 jan 2018 AppleUITheme-64.efi...

I got the following error : $ sudo nvram -c nvram: Error clearing firmware variables: (iokit/common) not permitted Is not the problem related to the fact I have apfs.efi in my drivers64UEFI folder ? (like in this thread) Is it not conflicting with my UEFI/ApfsDriverLoader.efi ?

I have indeed the same value in nanoseconds at each restart, and I have no USB flash drive connected. Should I clear the nvram ?

Still the same issue, nothing changed...

Hello, I am running Catalina 10.15.1 However, at every startup I got the following error message : panic(cpu 0 caller 0xffffff7f9404e6ad): "Unsupported GraphicsSchedulerSelect=2\n"@skl/IntelAccelerator.cpp:2070 (...) Kernel Extensions in backtrace...

Thanks, but I rebuilt my cache (sudo kextcache -u /), and still the same issue... what can I do ?

But I do not have such kext in my S/L/E and /L/E/ and neither in my EFI folder ! AppleALC.kext FakeSMC.kext RealtekRTL8111.kext X4250.kext AtherosE2200Ethernet.kext IntelMausiEthernet.kext SmallTreeIntel82576.kext XHCI-200-series-injector.kext CodecCommander.kext Lilu.kext USBInjectAll.kext...

I am able to boot however I get the following message error : panic(cpu 0 caller 0xffffff7f9404e6ad): "Unsupported GraphicsSchedulerSelect=2\n"@skl/IntelAccelerator.cpp:2070 Backtrace (CPU 0), Frame : Return Address 0xffffff81f31db8d0 : 0xffffff801113f98b 0xffffff81f31db920 : 0xffffff8011276c15...

Thanks but this is still not working. Anyone with an EFI that could work with Gigabyte z370N WIFI ? I do not understand what's wrong : https://www.tonymacx86.com/threads/macos-10-15-catalina-is-now-available-on-the-mac-app-store.284169/post-2015411