5. Click "OK". Now instead of picking from the library, do this: 6. Hold down “ Shift ” key (Press “Option” key if you are using a Mac), go to " File > Convert > Convert to [the format you want] ". 7. Pick the folder that has the music you want to convert. iTunes will just convert all the songs in that folder.
Click the “Choose Files” button to select your M4B files. Click the “Convert to iPhone Audio” button to start the conversion. When the status change to “Done” click the “Download iPhone Audio” button.
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