Tips Galaxy S II - reverting back to stock rom

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http://androidforums.com – hey all, im a newbie at all this and it seems my galaxy s2 is running into much trouble of late. The details on my phone is as follows- GT-I9100 4.0.4 I9100XXLQ6 kernel- 3.0.15-I9100XWLP7-CL340913 dpi@DELL134 #3 Build-IMM76D.XWLPW ---------------------------------------- Im detecting that there are some real problems with this on my SG2. Camera is able to take photos but the screen display is blank/black. Videos will film but when played back its blank/black screen. Sound is ok.I noticed i could not use the scanner either. Overall i want to revert back to my normal stock settings. i (General)