I'm also having this issue.
can you share how to get odin recognise the gear, because now it's only showing yellow triangle with error text, and i cannot perform the step to go to download or recovery mode.
when i do long press on the gear it's only go black screen for awhile then back to error with yellow triangle.
thank you for the reply.
Already found solution, i just flash Null TWRP form odin and my gear return back to android, after that go to download mode, then flash to tizen.