Downgrade from JB to ICS

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http://forum.xda-developers.com – Hello All Yesterday I flashed my galaxy note to JB update from this site /how-to-update-galaxy-note-n7000-to-412_6.html add viotutorials.com but today the phone won't boot and I have to flash it again to JB So I downloaded this ROM N7000JPLR8_N7000OJPLR8_XSG So is there any way to get back to this ROM ? even id coast me the data because I already back up my important data regards (HowTos)