Ankit - ProCam runs fine on my 521, so I assume it will also work fine on your 520. You have to install with a proxy set up in your WiFi. I used the
settings in this thread, but you may have to search for some different settings, if those no longer work due to a server change. I know there are other threads with different settings that work now. I prefer ProShot and you you don't need a proxy to install. You will need amber.