Particle Photon Setup Problem: Flashing Cyan with a Quick Red Burst(Bad Key Issue)

Just didn't know why the Photon cannot connect to the cloud and keeps flashing cyan (with some very quick red burst sometimes). But the Particle team has been really helpful! Check this topic:

https://community.particle.io/t/photon-setup-flashing-cyan-with-a-quick-red-burst-now-orange-burst-solved/12118/70

To sum up:

particle keys new particle keys load device.pem particle keys send <device_id> device.pub.pem // grab this file https://s3.amazonaws.com/spark-website/cloud_public.der particle keys server cloud_public.der

Then try to put the device into Safe Mode and it CAN finally connected to the cloud again!!!
(Dec 17 2016)

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This shit happened again Apr. 20 2017!!!!!!!!!

This time I fixed this with a easier way:

(1) Put the device into DFU

(2) particle keys doctor DEVICE_ID

Found DFU device 2b04:d008
Found DFU device 2b04:d008
New Key Created!
Found DFU device 2b04:d008
Found DFU device 2b04:d008
Saved!
spawning dfu-util -d 2b04:d008 -a 1 -i 0 -s 34:leave -D XXXYYYZZZDeviceID_rsa_new.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!!!
Opening DFU capable USB device...
ID 2b04:d008
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 = 0x00000022, size = 608
Download [=========================] 100%          608 bytes
Download done.
File downloaded successfully
Saved!
attempting to add a new public key for device XXXYYYZZZDeviceID
submitting public key succeeded!
Okay!  New keys in place, your device should restart.

(3) particle keys server

Found DFU device 2b04:d008
spawning dfu-util -d 2b04:d008 -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!!!
Opening DFU capable USB device...
ID 2b04:d008
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.

(4) particle flash --usb tinker

Found DFU device 2b04:d008
spawning dfu-util -d 2b04:d008 -a 0 -i 0 -s 0x080A0000:leave -D /usr/local/lib/node_modules/particle-cli/binaries/p1_tinker.bin
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!!!
Opening DFU capable USB device...
ID 2b04:d008
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 = 0x080a0000, size = 4740
Download [=========================] 100%         4740 bytes
Download done.
File downloaded successfully

Flash success!

ref:

https://community.particle.io/t/solved-photon-fast-blinking-cyan-with-a-random-red-burst/14359

https://community.particle.io/t/photon-setup-flashing-cyan-with-a-quick-red-burst-now-orange-burst-solved/12118/75

https://community.particle.io/t/photon-flashing-cyan-with-red-bursts-solved/25113/3