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Hi @LauraPomme - I'm not sure if you can, but I'd suggest reaching out to Fitbit customer support on this.
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Thanks for the help @Ozzie65! Welcome to the Forums @LauraPomme! I appreciate that you have shared your experience with Fitbit Zip. As stated by @Ozzie65, Zip's back door is not sold separately and the best is to reach out for Support's help.
To further assist you, I've created a Support case on your behalf - you should receive an email from Customer Support at the email you used to register with the Community forums.
Keep me posted if you have any other question. 😉
P.S. While you wait for Support to contact you, please take a look to our Warranty Policies.
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