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Paired but not sync

I haven't been using the device for a while and now I wanted to start exercising and counting steps again. I'm using vivo fit2 with iphone x

So I paired the device successfully but it fails to sync. The syncing ring starts to fill, but very slowly, then it stops. It shows the message "FileTransferErroe cancelledByApp"

is the a problem with the device? Any way can it be fixed? I wanted to try save money if I can use this one instead of buying a new one.