Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

Moof1904

macrumors 65816
Original poster
Hello!

TL;DR: Startup Security Utility is thwarting attempts to move my Sonnet M.2 NVMe boot drive into a “new” Mac Pro by not accepting my admin password.

Details:

I have been using a Mac Pro 7,1 for years and just purchased another 7,1 from eBay. One with better specs. The plan is to use the original one as a backup and enjoy the better specs of the “new” one.

I received the new one today and moved the Promise Pegasus J2i and Sonnet M.2 4x4 PCIe Card from the previous Mac Pro into the new one. I had been using one of the NVMe drives on the Sonnet card as a Sequoia boot drive.

The new 7,1 has Tahoe on its Apple SSD and after configuring it as a new user I attempted to set the NVMe drive I had been using in the previous 7,1 as a startup drive and I received the error message that the Mac hadn’t been configured to boot from an “external” drive.

When I rebooted in recovery mode, though, the Startup Security Utility acts as though my admin password is incorrect, even though it’s correct. Moreover, the utility doesn’t show any other admin users in the menu, either.

I have tried to fix this by changing the password using Terminal while in recovery mode and that didn’t work. I also tried to reinstall Tahoe on the Apple SSD startup drive, but the utility would only offer to reinstall Sequoia, not Tahoe, and wouldn’t do so on the Tahoe drive.

How in the world do I get into the Startup Security Utility to allow booting from the NMVMe drive on the Sonnet card?
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.