Go to settings->system->developer options, and enable usb debugging and rooted debugging.
Then do these adb commands to fix data on sprint.
adb root
adb shell
content insert --uri content://telephony/carriers --bind name:s:"SprInternet" --bind numeric:s:"312530" --bind type:s:"default,supl,mms,cbs,ia,dun" --bind protocol:s:"IPV4V6" --bind mcc:i:"312" --bind mnc:s:"530" --bind apn:s:"x.ispsn"
content query --uri content://telephony/carriers --where "name='SprInternet'"
note: make note of the _id# seen in the output of the above command
note: now, replace 3447 in the following command with your _id# from previous command
content insert --uri content://telephony/carriers/preferapn --bind apn_id:i:"3447"
I ended up flashing stock and then back to custom ROM. It helped.