Now you edit mobi and/or azw3 file. Since you are already using Calibre you can install "Quality Check" plugin and use it to quickly edit EXTH 113, 501 and 504,like this: select book(s) in Calibre>Quality Check>Fix>Fix ASIN for Kindle Fire.
Or you can edit those EXTH values with Mobi Metadata Editor, or Mobi2Mobi GUI, or...
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