Thanks for the tip. I was able to recover the Boron but not with the SoftDevice that comes with deviceOS@1.4.4. The softdevice that worked for me was the one referenced in the documentation here:
Download s140_nrf52_6.0.0_softdevice.hex, then use a -c option like: -c program /Users/rickk/Downloads/s140_nrf52_6.0.0_softdevice.hex verify reset This is not necessary in most cases.
This softdevice brought back my bricked Boron.