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authentication code , backup code

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My device is lost after I buy new device i login my Firefox account but asking authentication code but I lost my old device also lost my backup code now what to do ?

My device is lost after I buy new device i login my Firefox account but asking authentication code but I lost my old device also lost my backup code now what to do ?

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Presumably you didn't set up a recovery code either, so you'll have to start from scratch with a new Firefox account. Make sure to keep your backup codes this time. They are there for a reason.