MP 1,1-5,1 VSS2 header problem. Was going to do EnabelGOP, Need Help

[evnn22k]

I installed an RX 580 into my Mac, and honestly, no Apple logo screen or progress bars get annoying. Not knowing if any errors are present is even more annoying. So, I looked into EnableGOP and watched Mac Sound Solutions' video on how to do it. I ran a backup of my current ROM through the Macschraubers Rom Dump app and found this.

"Length of 2nd VSS Store is wrong (FF FF FF FF)
20454 bytes free space of 65464
VSS1 (Formatted) (Healthy), found 77 variables (30 valid, 47 deleted)
VSS2 (Formatted) (VSS2 header problem), found 42 variables (42 valid)"

I did try a sudo nvram -c to try and help, nothing changed. Every time I try to do the NVRAM reset on my keyboard, my USB power goes out before it can register the 3rd reset, so I only get to the second chime.

I am in no way familiar with how to handle ROMs or programming, I just want to be able to see my boot up screen and errors with the RX 580. Can someone help me fix or clean my ROM so I can carry out with EnableGOP?

 

[Bigwaff]

Version of macOS installed?

 

[evnn22k]

Version of macOS installed?

Sorry, I forgot to update this thread. I was able to fix the ROM on my own to flash EnableGOP successfully. Thank you for reaching out!

 

[evnn22k]

I installed an RX 580 into my Mac, and honestly, no Apple logo screen or progress bars get annoying. Not knowing if any errors are present is even more annoying. So, I looked into EnableGOP and watched Mac Sound Solutions' video on how to do it. I ran a backup of my current ROM through the Macschraubers Rom Dump app and found this.

"Length of 2nd VSS Store is wrong (FF FF FF FF)
20454 bytes free space of 65464
VSS1 (Formatted) (Healthy), found 77 variables (30 valid, 47 deleted)
VSS2 (Formatted) (VSS2 header problem), found 42 variables (42 valid)"

I did try a sudo nvram -c to try and help, nothing changed. Every time I try to do the NVRAM reset on my keyboard, my USB power goes out before it can register the 3rd reset, so I only get to the second chime.

I am in no way familiar with how to handle ROMs or programming, I just want to be able to see my boot up screen and errors with the RX 580. Can someone help me fix or clean my ROM so I can carry out with EnableGOP?

Update: I was able to get the ROM cleaned up enough to successfully patch it with EnableGOP and flash it. Everything is working now!

Thanks to everyone who offered to help and to those who took the time to point me in the right direction. I really appreciate it. Sorry for leaving the thread hanging — I just wanted to come back and let everyone know I got it sorted out. 👍

 

[reader50]

How did you sort out the error?

This is useful info for the next person who has the same problem, and finds this thread.

 

[evnn22k]

How did you sort out the error?

This is useful info for the next person who has the same problem, and finds this thread.

Honestly, I had to figure out a way to get passed that second NVRAM reset chime. Every power up, the Mac usually cuts my USB power for a few seconds then comes back. I hade to quickly repress the Command + Option + P + R immediately after it chimes to get it to register. My mistake was holding it the entire time. After the 4th chime, I did another backup to check the ROM status and found the VSS2 Header problem was gone and the rest of my ROM was healthy again.