I purchased 2 EC60 cameras and set them up with no difficulty whatsoever. They did a great job of recording.

After a few weeks I noted that the SD cards were full. So, I used the app to reform them. Then, recording stopped.  I can watch the cameras in "real time", no problem connecting etc. 

I removed both of them and added back, will see what happens, but there has to be a better way. 

Also I am US-based, the instructions here for finding H/W version are confusing and my eyes aren't good enough even w/a magnifying glass.