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Firstly you need to have a fitbit account with an ionic linked to it
Then you need to login to the account (https://fitbit.com/login) and change email, country and time zone to yours (Don't pick USA or Canada as country because you'll need to return the watch)
After changing these to yours go to (https://www.fitbitionic.expertinquiry.com/) and complete form with informations from your account (phone number and address can be random)
After completing a form you'll get your reference code, save it and wait for about 25 minutes.
Then go to (https://myhelp.fitbit.com/s/devicedisable) and just input the code