you cant pull the firm with cdma ws. i dont think you will be have much luck pulling the firm,we can pull system/boot/ect images from android devices but as you know thats not an android. i have seen firms for vzw and spr mifi's posted around the net,there are many platforms for these devices,not sure if they are reverse compatible or not but you should check for that before you render your device inoperable.
i am assuming you think the vzw os is a faster smoother running sys than the sprint one,or if not why do you wish to change it? i am curious.
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