Perhaps you could ask your friend to email that book to you instead of to your Kindle.
Failing that, you can download the MOBI on any E-Ink Kindle. The problem is, I don't know where if anywhere the Fire devices store Personal Documents, and it is very possible that as Kovid says they aren't available as MOBI, but instead use an obfuscated cache or similar.
I wouldn't know, since I don't have a Fire device.
This is why I would recommend getting the original file instead.
Last edited by eschwartz; 06-26-2016 at 09:55 PM.
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