This is HTC One M9 Android 7.0 (Nougat) official firmware for Sprint variants. Download from the link here, and follow the provided flashing instructions to learn how to install the stock RUU rom.
If you notice that any of the links provided below is broken or doesn’t work, please post in comments section so we fix and update it ASAP.
File Name: 0PJAIMG_SPRINT_HTC_ONE_M9_4.27.651.4_RUU.ZIP
Size: 1.80 GB
Android version: 7.0
Firmware – Download
How to flash
After downloading the Flashtool firmware, extract the zip content and execute the exe file (run) on your PC. Then follow the on screen instructions (wizard) to help you with installation.