This is due CM10.1 is ext 3 and msginger uses ext 4
From this point, your only option is to flash from sbf and start from 0 (root, sndinit and then install msginger it will work)
@walter small doubt, I felt that the torch is very low compared to cm7 or cm10
so I searched and I found these are the values to be changed
ro.media.capture.flashIntensity=41
ro.media.capture.torchIntensity=25
what you reccomend me to put? I've put 45 and photos are much better under the same conditions and flash looks brighter, you reccomend me other values or changing other parts from build prop?