Put in fresh fully charged batteries. After a few pulls mod says "check battery" when it is at 95%. (tried other batteries with same result). Thought I would try firmware. In the firmware procedure you are supposed to click "open" and browse to the firmware…did that but there is no .bin file like there is supposed to be according to the directions.
Original source: https://vapingunderground.com/threads/sigelei-sobra-problem.622646/