You can see blue halo even when the device is off, so I don`t think that it can be repaired by firmware, but the real thing is I have updated my edge 1030 with blue halo (very little halo yet) and right now I can´t see it.
Please, check this until you will be sure 100%. I’m about to send back my 4th! blue halo 1030. At the beggining, the blue halo it appears and seems to disappear, but it comes back until it grows.
Are you sure it's not because you were previously riding in the cold and it just warmed up? When I had the halo, it was showing up when riding in the cold and wasn't constant.