I'm sorry about the issue. Were you able to delete anything?
What do you have on your Kindle Fire, such as books, photos, videos, etc.?
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Besides the Kindle Fire, do you also have a Windows or Mac computer? If yes, when you connect the Kindle Fire to the computer, then open the kindle device on the computer and check?
Please type at the box below, then click on the Send button below to communicate with me, so I can help. Thank you,