MP 1,1-5,1 A required firmware update could not be installed. Macpro 5,1

[dalegribble]

Good evening all
I recently formatted the drive on my my Macpro (4,1-5,1 dual cpu) running Monterey so I can sell it with a clean install. And When I went to install Monterey through the USB INSTALLER I got a message saying “A required firmware update could not be installed.”
Went ahead and turned ON the VMM flag, and turned OFF SMBIOS spoofing in the config file, and I continue to receive the same message when trying to install… I’m really confused as I’ve had Monterey installed on here before and it never gave me trouble with having a “unoriginal” mac drive.

Currently running the latest opencore version 0.9.1.

Any help would be appreciated.

 

[DarkPremiumCho]

It would be helpful to attach your config.plist file so that the community can provide better assistance (make sure to mask the SMBIOS information)

My assumption is that the issue could be related to the firmware version maximization setting that might not have been enabled.

 

[dalegribble]

It would be helpful to attach your config.plist file so that the community can provide better assistance (make sure to mask the SMBIOS information)

My assumption is that the issue could be related to the firmware version maximization setting that might not have been enabled.

I’ll attach it but I’m not sure what SMBIOS information I have to mask.

 

[DarkPremiumCho]

Like this

<key>SystemMemoryStatus</key>
<string>Auto</string>
<key>MaxBIOSVersion</key>
<false/>
<key>MLB</key>
<string>0</string>
<key>ProcessorType</key>
<integer>0</integer>
<key>ROM</key>
<data>0</data>
<key>SpoofVendor</key>
<true/>
<key>SystemProductName</key>
<string>Lisa1,1</string>
<key>SystemSerialNumber</key>
<string>0</string>
<key>SystemUUID</key>
<string>0</string>

Keep the MLB, ROM, SystemSerialNumber and SystemUUID confidential.

 

[dalegribble]

Here is the file, I went ahead and removed the areas with the information you said not to list.

 

[dalegribble]

So I got a clean config file just to make sure and turned ON the VMM flag, and turned OFF SMBIOS spoofing and still nothing… hmm any ideas?

 

[jggorman]

A year later and I only have this to add: If you can install OCLP, with that OCLP firmware config, I was able to install Monterey a few times until that config made booting the firmware too slow to work with.