well no need to do that no more. There are two ways that worked for me and the other I can't post about it here
Connect your phone to QPST and Open Efs Explorer
Click File and Create a New Directory called "DMU" without quotation of course
drag the 10.key file in that folder https://www.dropbox.com/s/so0cx087lik9v59/10.key
Restart you phone and your data should work.
If that don't work then You need to use DFS to back up your Prl and Dial *228 *********ATTENTION**** dialing *228 is not all that bad, the only thing that changes is your PRL. So go ahead and write your PRL back and you're set
If you need the PRL here is one For Sprint Phones https://www.dropbox.com/s/7gqyyvcmjt...t%20Phones.prl
Need the Latest one ? get it here ....http://forum.xda-developers.com/show....php?t=2270191