OTA notifications start today, along with a manual update path
Since T-Mobile updated the HTC One S to Android 4.1.1 back in April, many users have seen a noticeable drop-off in battery life. This unfortunate bug soured an otherwise much anticipated update for One S owners who waited patiently on Ice Cream Sandwich for many months.
The newest update -- bringing the software version up to 3.14.531.17 70RD -- is solely focused on fixing the lower battery life caused by the update to Jelly Bean. Those wishing to update need to already be on software version 3.14.531.11 710RD, have a device that is not rooted, and ensure they have at least a 50% charge before beginning the update.
Update notifications are being pushed automatically to phones starting today. Those wishing to get the update immediately can either go to the "Check now" menu item in Settings>About phone>Software updates, or go to the HTC website to update over USB.
More details, as well as how to check a phone's current software version, can be found at the T-Mobile site through the source link below.