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Flashing RUU to HTC M9

First google for HTC M9 Drivers and install the drivers.

Second Install ADB and fastboot.

Connect the phone, wait till the system completes Driver installation

in Command prompt go to ADB folder /adb

use adb reboot-bootloader to reboot into bootloader mode.

fastboot oem rebootRUU to reboot in to RUU mode

download and rename ROM (RUU file) file to rom.zip

fastboot flash zip rom.zip

 

finish and reboot