MP 7,1 PRAM/NVRAM Reset in Catalina

[choreo]

Seems like in the old days, some sources recommended holding down Command+Option+P+R keys and allowing the Mac to restart through 3 chime cycles to reset. On my 7,1 in Catalina, it only lets me go through a single chime cycle and then continues to the logo screen even if the 4 keys are still depresses. Is this normal now?

 

[tsialex]

Seems like in the old days, some sources recommended holding down Command+Option+P+R keys and allowing the Mac to restart through 3 chime cycles to reset. On my 7,1 in Catalina, it only lets me go through a single chime cycle and then continues to the logo screen even if the 4 keys are still depresses. Is this normal now?

Nothing to do with Catalina or any macOS release. The reset is at the POST and you can't do it after the firmware transfer the control to the OS.

T2 Macs have different NVRAM reset rules and you can only reset it one time, Apple have/had a support article explaining the differences, but I couldn't find it now.

 

[TrevorR90]

I'm on Big Sur and it only allows for one cycle so its definitely not limited to which OS.

 

[bsbeamer]

Reset NVRAM on your Mac - Apple Support

If one or more settings stored in NVRAM don't work as expected on an Intel-based Mac, resetting NVRAM might help.

support.apple.com