Dude i just went through the same thing is your carrier sprint? if so get the stock sprint rom as stated above reflash an then go to phone dial ##786# reverse logistics support will be the screen do a reset it will ask you for you scp/msl code which at thios time should be 000000 enter the numers in he system will restart it will prep for first use once you align the screen it will say no sim if your has both punch 000000
then it will go to handsfree activation then you're good it will begain provisioning.
goodluck the boost and sprint are the same carrier so it will work thwe same GOOD LUCK