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From the Home ScreenMenu5th Listing (Settings)4th Listing (Device Options)5th Listing (Language and Dictionaries)1st Listing (Language)Spanish to English or whatever you wantOkOk/AcceptThe Paperwhite will reboot
or follow this link for detailed picture steps
Try the following steps and let me know the status.
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Video link for video steps: https://www.youtube.com/watch?v=xaHtr243Prs