Firmware converter

Hi, is there a way to convert a firmware (az-box s 700 b ntsc available here: http://www.sat-universe.com/attachment.php?attachmentid=49872&d=1205873076 ) to a strong firmware (4651x)?
The 1st has an AU embedded to decrypt n46r4 2 amzonas channels prvder 7211.
Thanks for your help.

Regards.