Build.prop is a file which is used to define the device's properties it is found in /system. devices cannot boot if the build.prop file is not in state proper, so better edit the file wisely. before editing write these commands in terminal setprop dalvik.vm.verify-bytecode false setprop dalvik.vm.dexopt-flags v=n,o=v rm /data/dalvik-cache/* rm /cache/dalvik-cache/* reboot BUILD.PROP TWEAKS:-