A while ago I damaged my watch because I put it on a fast charger by mistake. Several months passed and I reconnected it and it worked a little, but after a while the screen would freeze. But today I tried it again after almost a year and now it works perfectly. I don’t know the technical reasons, but it seems that the damage caused by the fast charger is not permanent.
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Either way a great result 
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Most likely, you had a blocked battery charge controller due to high charging voltage, over time the battery was completely discharged and the smart watch rebooted when charging again. If you damaged the charge controller, it would not recover itself, this is not the case when the wound heals))))