. These are official executable files or zip packages used to flash the device back to its factory-shipped state.
Because official support ended years ago, many users move to custom ROMs to keep the hardware modern: htc one m8 stock rom updated
To find the correct firmware, you must know your device's region or carrier. Fastboot Mode (Hold Power + Volume Down). Use a PC with ADB/Fastboot tools to run the command: fastboot getvar cid Common CIDs include (WWE/International) or carrier-specific ones like 2. Download the Correct RUU htc one m8 stock rom updated
Note: Unless you are using a specific Google Play Edition (GPE) model, the final official stop for the M8 is Android 6.0 Marshmallow. htc one m8 stock rom updated