Take a look at the customization for the Kobo Utilities plugin for saving reading status, etc. Once that is done, you can store the information from your current reader. Once you have sent your books to your new reader, you can select those books and Update Metadata in Device Library with the Date Added field set to Date. After that is done, you can use Store or Restore Bookmark with the Store button selected and set Reading status checked. You will have to create the custom columns needed for this.
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