Remove (not set) devices with a filter
I recently ran some testing on my site to see how page load times held up with a lot of traffic. Unfortunately, it took me a few days to realise that I had forgotten to block GA from seeing this, and as a result there is an enormous spike in my data, with daily mobile sessions going from 500-odd to 11,000 for 3 days (Jun 29th - Jul 1st). When doing through reports, I can see that all the extra hits were coming from a kind of Android device called (not set), so I want to filter out all the hits from this kind of device. However, when creating a custom filter I can't seem to do this. Can anybody help?
Re: Remove (not set) devices with a filter
There is no way to remove the data, once it's in, it's in.
That said you can create a segment to EXCLUDE this data; something like the screenshot in this link:
You should also add an annotation for other users.