On my ISY26:
Something when wrong when I updated. I downloaded the zip file and manually updated. Now the box is dead (well not accessible via the ethernet port). I've tried power cycling it and it still doesn't come back.
When I say not accessible, I mean it's not sending the UPNP broadcasts and it's not responding on the IP address previously used.
I don't have physical access to the box right now so I can't see the lights. When I do get back home, is there anything I should check before trying to factory reset it?