Root Repeated Boot after modifying build.prop galaxy ace duos s6802

[dipankarchetia]

After modifying my build.prop, My phone is not booting, it shows Samsung logo for some time then again it boots. How to solve this?
I have read another thread here, but not able to solve my problem with the procedure described here.
My phone is not booting, so how can I place any update.zip file to sd card.
I am attaching my original build.prop file here.
Please help me, I have ruined my phone.