I tried everything (reset router, use the Particle app, command line, update firmware ) to activate my Photon at home but it keeps blinking green.
So I went to a friends house and used their wifi connection and big surprise: all went fine!
I am using an ATT U-verse 3801HGV router and there seems to be a big communication issue.
Anyone experiencing the same issue?
ps. I have 2 Cores and they work just fine with the router.
It looks like these routers use a default encryption key that is in hex (not ASCII) from a label printed on the bottom of the device unless you configure it otherwise. I am not sure a hex encryption key will work with Particle, so I would try a different ASCII value for the key.
Are you using WEP or WPA2?
If you are using WEP (which I guess from your reference to the default password), you should have considered to take @bko’s advice serious.
The Core might work well, but the Photon uses a different brand WiFi module, hence there was a thread about the peculiarities of WEP on the Photon
But my personal advice would be to use WPA2 instead of WEP otherwise you can leave your WiFi open just as well.