I upgraded to 6.12.173 and lost root even though I used voodoo OTA. Don't know how to get it back without going back to previous version.
I have the same problem- I used Voo-doo to save root but it must have failed - no root
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Were you able to restore your protected copy of SU with VooDoo or are you getting a specific error by a root app that you cannot obtain permission?