Connect to a stable Wi-Fi network and ensure your battery is above 50%. Go to > About > Software updates .
If your device is stuck in a boot loop or you have previously modified it with custom software, you may need to use an RUU. This tool completely overwrites your current software with a fresh factory image. HTC One M8 Flashing a RUU of TWRP Recovery in Hboot htc one m8 stock rom updated
Tap . If an update is available, follow the prompts to download and install it. 2. Using ROM Update Utilities (RUU) Connect to a stable Wi-Fi network and ensure
For the majority of HTC One M8 variants, the official software support concluded with . This update introduced critical features such as Doze for battery optimization and refined app permissions. This tool completely overwrites your current software with
This is the simplest method and is recommended if your phone is currently unrooted and running an official HTC ROM.