Revert to stock after cm12 and encrypted

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May 3, 2016
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SPH-L710. I bought it refurbished with 4.4.4. I installed cm12, then encrypted it.

I need to go back to stock so I can activate (Ting/Sprint) after porting a different number to the phone.

Will the instructions in the following link work? http://forum.xda-developers.com/gal...-flashable-t3007847/post58297282#post58297282

Or is it not possible to go back to stock after encrypting?

A side note - why does the file name end with .tar.md5? I have never seen .md5 used for anything other than md5 hashes before.