Okay, just to make sure you don't try changing the baseband again, that's very dangerous once you've been on ND8.
You absolutely cannot downgrade the modem or bootloader once you've Odined the stock ND8 tar.
People have hard bricked their phones trying that.
You need to Odin the stock ND8 tar again to get your modem back.
What recovery have you been using? Philz Recovery is the only recovery that's been confirmed working 100% once you've been on ND8.
Sent from my Sprint Samsung Galaxy SIII on TouchWiz 4.4.2 with Wicked X v6.5, Ktoonsez' latest kernel and the latest Philz Touch Recovery.