[Q] LG Optimus G F180s topic

Hi All members...
Bought New Lg Optimus G F180S...
My younger Bro wants to root it...i dnt dnow what he exactly did with it..but something went wrong..n he messed up with it...
now phone is on "LG boot loop..Security Error"
NOw phone not detecting with pc...in any mode
well...white pressing "VOLUME UP + POWER" it shows Lg service mode
while VOL DOWN + POwer" phone asking to erase data n continue..
& finally In DOWNLOAD mode VOL UP + VOL DOWN with usb connected...phone not detecting with with in any mode...
Any idea for it....