If you don't have a sdcard and don't you plan buy a new one, no need to back rc1.
Comment out line 2 (system/system.prop) like this:
Code:# Store dalvik-cache on /data #dalvik.vm.dexopt-data-only=1
In recovery, clear dalvik cache and reboot. Dalvik cache regenerated on /cache.
system/system.prop or build.pro??