Jfalls63
Android Expert
OK3 is the latest that Sammobile has for it also.
https://www.sammobile.com/firmwares/database/SPH-L720T/
Seems to be a small security update. There is a little about the update for the L720 at XDA.
https://forum.xda-developers.com/galaxy-s4-sprint/general/software-version-l720vpsgpl1-t3548247
You could always flash back to stock then take the OTA and then install TWRP and root again if you can't ignore the update.
https://www.sammobile.com/firmwares/database/SPH-L720T/
Seems to be a small security update. There is a little about the update for the L720 at XDA.
https://forum.xda-developers.com/galaxy-s4-sprint/general/software-version-l720vpsgpl1-t3548247
You could always flash back to stock then take the OTA and then install TWRP and root again if you can't ignore the update.