I have a New Model F keyboard and I'm trying to flash the firmware to change the layout.
I did this once successfully, but I'm trying to redo it and now I can't get it into bootloader mode.
The last time I used "qmk-pandrew-macos-util-20210321.dmg" and it worked great, but now it doesn't recognize the controller:

I've tried various keyboard shortcuts (shift+B, etc) and "shorting two contacts while plugging the keyboard in, and releasing after" but that doesn't seem to do the trick.

Any ideas how to get a new model F keyboard controller into bootloader mode ?