Help | cannot root my p880 through All in One Tool (by OS Hacking)

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http://forum.xda-developers.com – hi all, when i operate this tool in order to root my phone i always get the message "Select ADB Slidload", unfortunately can't seem to find any instance of it... what did i do wrong ? i cannot root with onxr, it couldn't push su through adb though it is turned on (USB debugging), and the driver is recognized by device manager... TIA to all supporters - rMaNe_IL (HowTos)