Xseries :: X6 - 8GB | Navigation Keys Lights Always On?

The navigation keys on Nokia X6, viz,. call(Green) & End (Red) always stay on, even after the screen lock. Normally, they are supposed to turn off automatically, when you lock the screen.I tried resetting the phone to Factory Settings, which failed solving the issue. I though of re-installing the phone software. During the re-installation, I see a screen that shows the progress of the installation, with a notice stating "Do not disconnect your phone" & "During installation, your phone restarts & screen goes blank." Well, when the installation progresses, the phone restarts, and the Ovi Updater shows "Lost connection to phone. Reconnect & start again". Everytime I reconnect and start again, the phone restarts in a while & I see the same old "Lost connection to phone" error. It runs like an infinite loop.