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Precision 5550: seeking working EFI


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hi, I have a Dell Precision 5550 with i7-10850H and Nvidia T2000. Specs are similar to the XPS 15 9500 model discussed here.
I cannot find any EFI that boots, including those posted for the XPS 9500.
I have the 1.19 BIOS installed. Does anyone have an EFI that should boot ?

 

@djuby I was suspecting the USB part of things, what USB-c port are you using and which dongle and type of stick?

I am trying a Big Sur installer now with the last EFI posted and it seems all goes well but the UI does not start.
Last thing in log is : AppleActuatorDeviceUserClient::start entered and the nothing.

Any help is greatly appreciated!

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