I haved the same Problem and after many long searching i found this File.
Just place the Zip on Sd go to Stockrecovery and install the Zip and the Problem is solved.I hope thats help any Users.
Here is the original Link:
But i attached the File too for direct Download:
UPDATEownload the latest Superuser3.2-RC:incl.newest Binary.
Just install the Superuser zip in normal Recovery,done
BusyBox latest bin:1.20.2 no idea how to install(have it with my pro version automa.)only uploaded for the req. from:savie(just extract the file)
NOTICE THE FILES ARE ALL OFFICIELL DOWNLOADED/NO CRACK VERSIONS
FOR INFOS TRY GOOGLE
All hail to ChainsDD!!!