Hello @aroranamit, awesome to have you here in the Fitbit Community as a new member! In this case I believe the hiccups to sync your tracker are related to the fact the mobile phone you are using is not listed yet as a compatible device.
With this I do not refer the tracker won't work with your phone, the only difference is we cannot guarantee the behavior of the app in relation to functionality since the app is not optimized to run with the device in questions, so in occasion some feature or sections of the app might not work as is expected. Nonetheless it would not hurt to try the following suggestions: Having trouble syncing? (here's how to fix this).
To see the latest list of supported devices, please go to http://www.fitbit.com/devices. If your device isn't listed, you can check the link at a later date to see if device support has been added. Our team is always working to test and add more Android devices to the supported devices list, so keep an eye open for updates!
See you later and let me know if you have other questions.
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