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i think its your network problem
if you try to update with SUS and middle of work it says update faild..then try again it will start update form where its faild
like your problem taht with 34% got faild..just try again and it start froms 34% agian
i myself do this tihng 6 or 7 times middle of my update and it were because of my network connection
Maybe...let do this...uninstall Sus and reinstall it...and try to perform update another time