Imp firmware update

I have 4 imps that start a firmware update and don’t finish.
Then when I restart them they flash amber/red and do not connect.
I can turn them on and off many times, I might get them to connect again but then they just start the firmware update again. I have 2 that work. HELP! mac:0c2a69003909

Sounds like they are having problems contacting the upgrade server, or getting the IP address to connect to.

Do you have DNS relay turned on on your router? If so, disable this and try again. Early imps (and 3909 is quite early) didn’t have a workaround for routers with bad DNS relay behaviour.