If you are interested in seeing what Android L may look like on an HTC device, you are in luck thanks to the efforts of the folks over at the XDA Forums. Senior member ssrij and several other developers managed to hack together a version of Android L for the HTC One (M7) using ramdisk and some kernel modifications.
The Android L port they created is still very rough and several functions are not yet operating. That includes features like WiFi, Bluetooth, the camera, and sound. You can still get a feel for what Android L will look like, which was the main goal in Google’s release of the developer preview in the first place. Even the official developer preview has proven to be a little too immature and missing too much for most people to consider making it a daily driver.
If you want to give Android L a try on your HTC One (M7), hit the source link for more information on how to grab the ROM.
source: XDA Developers