Originally Posted by dalfshiro View Post
i have installed htc sync manager on PC.but my phone wont detected fastboot.

edited : windows 8.1 cant detect htc usb driver
Your supposed to go to bootloader on your phone by holding volume down and power. Then press power to get inside fastboot. On you phone it should say fastboot usb or something with usb. Then run the ruu and thats it. How hard is that? Why don't you try google or youtube around for how to run ruu?