Now I remember, It had all started after my phone had gone to dead state and that was the 1st time I tried flashing kernel after that i think this problem started.

My phone initially had Global Firmware but after flashing i think now it has Indian firmware.
Now when i am trying to download the firmware, it shows

"Product ID not valid. Please re-enter the 15-digit IMEI code."

Now this is new F**ing problem, I bought this phone from USA and now i stay in India so warranty is not valid.