Please help! I can't boot or flash boot, can't upload anything to my watch

I'm so sorry because I was new here. I've just bought a G Watch Urbane and try to Root it with some guides here. But when I finish debugging and adb bootloader, I try to boot it with some .img file but It always send back error message, I'm so confused now and don't understand what to do to root my device now. Please anyone help me.

Code:

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sending 'recovery' <17904 KB>...
FAILED <data transfer failure <Unknown error>>

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I'm sorry that I can't post image here because I don't have 10 posts, so please help me if you can :(

Thank you guys so much

P/s: I've just realize that I posted this post in wrong Section, please any Mod move my thread to Q&A please, thank you