Issue installing New Recovery

Hello folks,

I am trying to upgrade the CWM recovery from 6.0.3.6 to 6.0.4.3 to install KitKat.
However, when I try installing the zip file, the phone simply reboots from recovery during installation.

I tried ROM Manager too, but it couldn't install the latest recovery as well.
No luck with TWRP zip file as well :(

Anyone faced any such issue ? Any help is appreciated.

Thanks