HI, guntawang, welcome to Kindleboards!
Two things to consider:
Have you put the files into the Kindle's 'documents' folder - that's where they need to go.
Are the files of a compatible type for the Kindle? Amazon says:-
Two things to consider:
Have you put the files into the Kindle's 'documents' folder - that's where they need to go.
Are the files of a compatible type for the Kindle? Amazon says:-
Edit: Also, if the books are Amazon books you downloaded to a previous Kindle, you can't just transfer the files to your new one - you would have to re-download them directly from your archive at Amazon, either directly from the Kindle or from your 'manage your kindle' page.