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[kde] Cannot open kdewallet after upgrade to KDE 4.13.3


I regularly copy my ~/.kde/share/apps/kwallet/kdewallet.kwl file to an external drive to have a backup if something went wrong. Never had any problem until a few days ago when I upgraded from 4.13.2 to 4.13.3. After upgrading I went to ~/.kde/share/apps/kwallet to manually backup as usual and saw there was a new file named kdewallet.salt, which I had never seen before (because it wasn't there before). In a moment of "genious" I just deleted that kdewallet.salt file thinking it was just some temp file. Clearly I messed up as now I can't open my wallet anymore, it won't take my password and fails with "Error code -9: Read error - possibly incorrect password.". I can't recover any copy of the wallet prior to the upgrade so I'm stuck. All my passwords are in there and I know not what to do. I've already tried opening the wallet on a system with KDE 4.11 but it fails with "unsuported file revision" or something similar. Any ideas anyone ? :(
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