I tried the same thing that derrtydee did, but first I downloaded the drivers from this site , impactor, followed all the steps to no avail. Then I went to the samsung page downloaded their drivers, plugged in my gear to the pc, charging icon pops up, loads impactor no device found. Yes it is in debug mode, I rebooted it, deleted and reinstalled the drivers, files but still no go. Can someone help me, please?
I had the same problem before and i remembered that i read or whatched that you need to have the firmware mk7 something. I searched for the firmware, there is a thread on the latest here in XDA and downloaded it. Then changed my stock firmware to mk7 and did the steps to root and install twrp and null rom. And it worked! My Galaxy Gear is not running in Null ROM! Hope this helps