If you reflashed with the kdz you won't need the modem just the baseband and the rom
If your ever stuck in that loop
1. Make sure it is not plugged in
2. get the phone to completely shut down
3. Press and hold volume down Then press and hold power
4. as soon as the LG logo pops up release and press both again
5. a white screen will appear that asks you if you would like to factory reset press power. button 3 times don't worry it will only open your custom recovery it will not mess up your phone.
I know that the LG logo only appears for a brief second when that perticular brick happens so step 4 has to be done really quickly but it does work I recovered mine