[Q] Urget! Need guides to install 2.2 Froyo! (p990)

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http://forum.xda-developers.com – My LG-p990 is 2.3.4 (Gingerbread) and I wanna downgrade it to Froyo in order to root it without the help of my PC. Can anyone here are give me the guides of installing 2.2 and the zip file? I really want to OC the phone:p:p:p (HowTos)