Unfortunately it’s not possible to change the email address registered to your my.remarkable.com account, although this is something we’re looking at for the future.
Please note that your files are stored on the reMarkable paper tablet itself, so an easy workaround for now is to create a new account on my.remarkable.com using your preferred email address. Once you connect your reMarkable to your new account, all the files stored on your paper tablet will automatically be synced to the new account.
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