This outlines how I did it:
Need to Download Segger JLink. This is used to flash the board.
J-Link Software and Documentation pack for MacOSX
For Mac I installed: JLink_MacOSX_V612f.pkg
After it was installed I was able to run JLinkExe (it put it in my path)
SEGGER J-Link Commander V6.12f (Compiled Jan 13 2017 16:41:09)
DLL version V6.12f, compiled Jan 13 2017 16:40:56
Connecting to J-Link via USB...Updating firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Nov 14 2016 16:58:29
Replacing firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled May 4 2015 13:48:48
Waiting for new firmware to boot
New firmware booted successfully
Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Nov 14 2016 16:58:29
Hardware version: V1.00
VTref = 3.300V
Type "connect" to establish a target connection, '?' for help
I had to use SWD:
JLinkExe -device nrf51822 -if swd -speed 2000
Downloading file [nrf51422_xxac.hex]...
Comparing flash [100%] Done.
Erasing flash [100%] Done.
Programming flash [100%] Done.
Verifying flash [100%] Done.
J-Link: Flash download: Flash programming performed for 1 range (4096 bytes)
J-Link: Flash download: Total time needed: 0.132s (Prepare: 0.043s, Compare: 0.004s, Erase: 0.000s, Program: 0.075s, Verify: 0.001s, Restore: 0.008s)