Sprint HTC One M8 is getting new software update to build version 1.54.651.10. This update brings fixes to network connectivity and improvements (data and voice connections), according to Sprint’s released notes. If you have affected and experiencing data connection failures and re-attempts to connect in low coverage areas, as well as the voice connection, then you urgently need to update to 1.54.651.10 now. This is an urgent software update and rolled out in batches via OTA, and just around 56.33MB in size.
Those who may not been rooted their HTC One M8 may simply take the update via over the air, while for those who might need to grab the 1.54.651.10 OTA update flashable zip, the new Radio, or the RUU files. Just head-over at XDA-developers thread and look for the file. You may simply flashed the download firmware files via fastboot recovery.
Thanks to [jonathan3579] for the screenshot.
Source: Sprint Community