[Q] Build.prop Problem topic

i just replaced the original build.prop files by a custom one build i forgot to change permissions and my device doesn't boot further nokia logo.
ITS allowing me to go into recovery and there i flashed the original zip of build.prop{i have just made it before replacing} but when i apply update from sd it fails.........

i have done factory reset but it doesnt work
please help me

xda-developers