Sorry guys it's a really busy day and I only have a minute but here is
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To use this decrypt your Mass Effect 3 save with Bruteforcesavedata. Then open Gibbed MassEffect3 SaveEdit and click open and change from "Mass Effect 3 Save" to "All Files" find your save and open the "CHAPTER" file.
I do not have the game so I've not tested other than to open a save and then resave it.
Posted link to updated Bruteforcesavedata in first post. Should fix resigning problems.