Reloading firmware on rooted LG p500

I bought a Lg p500 with froyo last year.I upgraded it to gingerbread(v20C) last month & subsequently rooted it using gingerbreak.But accidentally I uninstalled market app after which I was unable to download apps.So I unrooted my phone & reloaded GB(by KDZ updater) again but this time it was v20B.Later I found this had few bugs so now I want to reload v20C firmware again but even after repeated attempts (using KDZ updater) Iam getting "phone not connected" error.Kindly help in this regard.Thank you!kg

Hi everybody,Iam happy that so many people my query but unfortunately I didn't get a reply.Thanks anyway,I had to do my homework!
Actually I got the solution & thanks to Mr Neal Pradeep.His tutorial helped me a lot.Here is the link in case u need > http://androidadvices.com/restore-gingerbread-233-v20b-firmware-lg-optimus/2/.
And yes prior to that make sure that ur USB port & cable are working properly :-)

Hi everybody,Iam happy that so many people viewed my query but unfortunately I didn't get a reply.Thanks anyway,I had to do my homework!
Actually I got the solution & thanks to Mr Neal Pradeep.His tutorial helped me a lot.Here is the link in case u need > http://androidadvices.com/restore-gingerbread-233-v20b-firmware-lg-optimus/2/.
And yes prior to that make sure that ur USB port & cable are working properly :-)