Ok back when I originally rooted I ran into this problem but I can't remember how I fixed it. Granted I know all the typical things you should know about installing this (IE...update.zip is in root, etc.) I'm not a noob in this regard yet I'm getting stuck when I'm in recovery & installing the zip from the SDcard...I've flashed the SPRecovery & regular ESE80 then installing Update.zip but get the same message... getting the "E:Can't open /cache/recover/command --Install from sdcard... Finding update package... Opening update package... Verifying update package... E:signature verification failed Installation aborted.