OK. Did that. What next? The LED pattern has not changed.
[Toms-MacBook-Pro:~] tom% particle keys server
running dfu-util -l
Found DFU device 2b04:d006
checking file /usr/local/lib/node_modules/particle-cli/keys/rsa.pub.der
spawning dfu-util -d 2b04:d006 -a 1 -i 0 -s 2082 -D /usr/local/lib/node_modules/particle-cli/keys/rsa.pub.der
dfu-util 0.8
Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2014 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to dfu-util@lists.gnumonks.org
dfu-util: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release!!!
Deducing device DFU version from functional descriptor length
Opening DFU capable USB device...
ID 2b04:d006
Run-time device DFU version 011a
Claiming USB DFU Interface...
Setting Alternate Setting #1 ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 011a
Device returned transfer size 4096
DfuSe interface name: "DCT Flash "
Downloading to address = 0x00000822, size = 512
Download [=========================] 100% 512 bytes
Download done.
File downloaded successfully
Okay! New keys in place, your device will not restart.
[Toms-MacBook-Pro:~] tom%