when i flash a new modem i use the .pit that came with the version of android i'm using (eb13 deodexed ext4 downloaded from AC). put it in the pit section, and the modem in whatever the 2nd section is below that. The top space is for the android OS itself. the next line is modem. when i wanted to put the ec05 modem on my phone i just redid the whole phone- new odin with .pit, eb13, and ec05 modem. put in odin in that order. run like normal.