Please tell us some basic information before asking for help:
Model Name:ZB631KL
Firmware Version:0.75
Rooted or not:no
Frequency of Occurrence:
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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While charging my device , the led light started blinking red and green rapidly and the screen showed Charging and charged simultaneously.
I don't know if this is the problem of cable or firmware Bug but I'm pretty sure this might be the firmware bug.
if someone has also observed the same please report.