My colleague's apple macbook pro 16 2019 had catalina installed, when I try to install Apple configurator on it, it said I need tu upgrade to at least monterey. I upgrade his mac to macos 14.6 sonoma.
Then I try again to install apple configurator from applestore. This time, the install succeded.
And I start to follow the steps of How to revive or restore Mac firmware - Apple Support
I will call Macbook pro 16 2019 Mac A and my macbook pro M3 pro Mac B
Mac A has sonoma
Mac B Failed to activate
- I connect Mac A to internet with a good speed and also to power till it gets full charged
- On Mac A, I launch Apple Configurator showing the message "Connect device"
- I shutdown Mac B and plug it into power
- I use a Type-C to Type-C white cable of Mac A to connect the two Macs (Any type-C port of Mac A to the most left Type-C port on the magSafe side of the Mac B)
- At this time, everything was setup and ready to start the process, I got the big breath!!!
- On Mac B I press Power Button and the control +option + right shift, the first time I missed it and the second time I got it right.
- I realize I got it because I press power button first just before it starts, add control+option+right shift while still holding power button. It all about timing. Power button pressed, the Mac B starts and instatntly while holding Power button, press control+option+shift for 10 seconds. I got DFU on the Mac A screen in apple configurator.
- I restore the Mac B
I hope this come help, That what I did for my Macbook Pro. I was not believing that could work succefully as it was my first time to do it, but I was surprised and happy at the same time when I see DFU on the Mac B screen.
Good luck