can you help me?. this watch is brand new 
Let the battery run dry. When the battery is completly empty, flash the original firmware by using the flashtool. Use the “firmware update” option instead of “download only”.
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And when he says empty he means " EMPTY " . Keep rebooting the watch until its unable to reboot . Make sure its completely dead 
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Actually, running flash tool with the original firmware, then connecting the watch and hard resetting it with the power button should do the trick without draining the battery 
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It is definitely worth a try to try it with a charged battery first. In my case, it has only worked with an empty battery on A10 devices.
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Same here . I tried @iscle suggestion without success before
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