One of the most popular roms for the HTC One M9 has just been updated to Android 5.1. This rom is based on the new 5.1 leak build version 2.7.401.1. This rom is a Sense rom with some included performance tweaks and customization options. Some features of the rom include an added native display color control, added multiuser control, HTC flashlight, Pen Power Keyboard, APM activated by default, performance and battery enhancements, camera improvements, and New UI animations.
Some bloat has been removed such as google sheets, google slides, and fitbit. SuperSU has been added all OEM apps have been updated, and there are plenty of other changes here. Since this is a custom recovery you will have to be bootloader unlocked, with custom recovery installed. Grab this rom from the link below.
via LlabTooFer