That was a big help, yes the device was still set to Photon, but I did not even notice that was a selectable field. Thanks for the screen capture. Now I am blocked at a different place: After hitting the green right arrow to start the debug it appears to have compiled but I have a blocking dialog with " Failed to launch OpenOCD GDB Server: Timeout., with a "Cancel" and "Open launch.json" buttons.
Terminal Output:
Executing task: make -f '/Users/dfichou/.particle/toolchains/buildscripts/1.9.2/Makefile' flash-debug -s <
:::: PUTTING DEVICE INTO DFU MODE
Done.
:::: FLASHING APPLICATION FOR DEBUG
text data bss dec hex filename
752864 2244 80828 835936 cc160 /Users/dfichou/Particle/First/target/1.4.4/boron/First.elf
dfu-suffix (dfu-util) 0.9
Copyright 2011-2012 Stefan Schmidt, 2013-2014 Tormod Volden
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to dfu-util / Tickets
Suffix successfully added to file
Serial device PARTICLE_SERIAL_DEV : not available
Flashing using dfu:
dfu-util 0.9
Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to dfu-util / Tickets
Opening DFU capable USB device...
ID 2b04:d00d
Run-time device DFU version 011a
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 011a
Device returned transfer size 4096
DfuSe interface name: "Internal Flash "
Downloading to address = 0x00030000, size = 755116
Download [=========================] 100% 755116 bytes
Download done.
File downloaded successfully
Transitioning to dfuMANIFEST state
ONCE YOU ARE FINISHED DEBUGGING REMEMBER TO RUN
Particle: Flash application & DeviceOS (local)<
*** FLASHED SUCCESSFULLY ***
Press any key to close the terminal.
I am running on macOS Catalina (10.15.3) and I do have the Nordic tools installed (for other work).