For OTA updates, sort of, but you're using the stock Recovery not a custom one

RUUs are a different matter and aren't like flashing a custom ROM
HTC One M8 (Gunmetal Grey) 16GB
ROM: 1.54.401.10 (KOT49H) | HBOOT: 3.16.0.0000 S-OFF | Recovery: Stock | Baseband: 1.16.2133156.UA15G_20.18m.4096.07L | Kernel: Stock | CID: HTC__001

OnePlus One (Sandstone Black) 64GB *** PENDING ***

If you have a question, great - but DO NOT PM ME WITH IT!!! | [GUIDE] Return your EU M8 to 100% Stock (S-OFF Required)