Dude i appriciate your help !! Thanks just let me know wheather i am the only one getting this error or this something common
May be it will take some time to check for updates . I'll be sending my phone service centre so it should be running stock that i have got 18.0
flash via updater app...
Here is how to do it in case you don't know...
> Place the downloaded .zip in downloaded_rom folder in your internal storage (do not rename it to update.zip)
> Press the menu key and select "Select update package" (navigate to the proper location and select the file)
> Select update
> Once flashed, reboot when prompted
> Flash again the same file the same way, reboot
You are good to go
Hope this helps..