I just got my phome after a week of travelling through mobile repairs and HTC service centre.
I flashed the boot.img and recovery.img from the nand backup, Then restored the same backup from the CWM recovery. During the restore process, i got the error "error while restoring /sdcard/.android_secure" after which, the restoration stopped. Upon reboot, the phone started normally. Everything appears to be stock. I'm attaching images so that you guys can confirm it as well.
I got the stock recovery.img from this link: http://d-h.st/VIZ
, worked properly this time.
Right now i'm downloading the OTA upgrade on my phone...let's see what happens this time.
Update: It worked!!!! though i locked the bootloader (fastboot oem lock) before starting the upgrade.
Thank you all for the help!!!