OTA is not an option. What you are looking for is RUU_SuperSonic_S_Sprint_WWE_3.30.651.2_Radio_2.15. 00.09.01_NV_1.77_003_release_154209_signed.
It can be found at
Multiupload.com - upload your files to multiple file hosting sites!
This is an executable that you run on your PC while your phone is connected to it.