Exclamation [Q] Stuck At Boot Loader

I updated the CWM to 6.x and tried to install KitKat 4.4.4 on my P500 and now, it stuck at bootloaded. Tried different ROMs but still stuck at bootloader.

I am able to open CWM recovery, install zip even can mount USB or /system and run adb shell. Able to connect it in emergency mode (PC detects it), but KDZ does not recognize the phone.

I tried the LG support tool, that told me that the software is already up-to-date. When I try to update recovery, it stuck at 11% and says there is some issue in PC communication.

Can this be an issue of baseband? I am not sure what to try next.

***Have removed the sd-card also to see if that helps.
*** also tried on different machines with xp, win 7, win 8.

Can anyone help?