I guess I jumped the gun - It compiled successfully but the flash downloads once and then fails:
:::: FLASHING APPLICATION & DEVICE OS
/cygdrive/c/Users/norma/.particle/toolchains/deviceOS/3.1.0/modules/tracker/system-part1/makefile /cygdrive/c/Users/norma/.particle/toolchains/deviceOS/3.1.0/modules/tracker/user-part/makefile
text data bss dec hex filename
503204 3030 62368 568602 8ad1a …/…/…/build/target/system-part1/platform-26-m/system-part1.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 http://sourceforge.net/p/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 http://sourceforge.net/p/dfu-util/tickets/
Opening DFU capable USB device…
ID 2b04:d01a
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 = 506238
Download [=========================] 100% 506238 bytes
Download done.
File downloaded successfully
Creating c:/Dev_Area/FT/Particle/NewEagle/targets/tracker/tracker-edge/target/3.1.0/tracker/platform_user_ram.ld …
Creating c:/Dev_Area/FT/Particle/NewEagle/targets/tracker/tracker-edge/target/3.1.0/tracker/platform_user_ram.ld …
text data bss dec hex filename
106904 744 1340 108988 1a9bc c:/Dev_Area/FT/Particle/NewEagle/targets/tracker/tracker-edge/target/3.1.0/tracker/tracker-edge.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 http://sourceforge.net/p/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 http://sourceforge.net/p/dfu-util/tickets/
No DFU capable USB device available
make[2]: *** […/…/…/build/module.mk:126: program-dfu] Error 74
make[1]: *** [makefile:86: /cygdrive/c/Users/norma/.particle/toolchains/deviceOS/3.1.0/modules/tracker/user-part/makefile] Error 2
make: *** [C:\Users\norma.particle\toolchains\buildscripts\1.10.0\Makefile:92: flash-all] Error 2
The terminal process “C:\Users\norma.particle\toolchains\buildtools\1.1.1\bin\bash.exe ‘-c’, ‘make -f ‘C:\Users\norma.particle\toolchains\buildscripts\1.10.0\Makefile’ flash-all -s’” terminated with exit code: 2.
Press any key to close the terminal.