<https://www.freakgeeks.com/how-to-downgrade-ipad-06-15-00-baseband-to-05-13-04-iphone-baseband-with-redsn0w/#webpage>
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"Using the latest redsn0w tool, you can now downgrade your iPhone baseband from 06.15.00 to 05.13.04 and enjoy full unlock and GPS capabilities."
<https://www.freakgeeks.com/how-to-downgrade-ipad-06-15-00-baseband-to-05-13-04-iphone-baseband-with-redsn0w/>