Hi @SumanVemula, welcome aboard to the Fitbit Community! My apologies for the late response and I was reading your are not able to update the firmware using your phone. How it goes so far, is the issue persisting?
I would like to recommend the following help article for additional help: Why can't I update my Fitbit device?
Keep in mind this phone is not listed as compatible and some behaviors might not be as are intended. For more information about compatibility refer to this help section: Which phones and tablets can I use with my Fitbit watch or tracker?
See you later and take care.
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