There are modem links on xda if that is all you want.
This to me is the best option, and it is what I did. I flashed just the new FP1 radio/modem.
FP1 - All packages up to date - xda-developers
Also, for those who are rooted and want to stop the OTA notifications, here is a link that tells you what to do.
Stop ota notification fix - xda-developers
For those who don't want to go to XDA, here are the steps to follow to stop the notifications if you are rooted and do not want the update. You need root explorer or an equivalent app. This solution was posted by XDA members RWNube and motcher41.
Better way by RWNube:
Here is what should work:
Open Root Explorer, browse to /system, mount R/W, long press build.prop, and select Open in Text Editor.
Find the line:
ro.build.fingerprint=verizon/SCH-I510/SCH-I510:2.3.6/GINGERBREAD/EP4:user/release-keys
Change this line to whatever the new ROM's equivelent build.prop's line is. I suspect that just "EP4" needs to be changed to "FP1".
Save the changes to the build.prop file.
Restart
You may have to restart a few times to get data back working, you can also turn data off and on again, see if that works. That worked for me after one restart, notification for update is gone.