Default Help resetting my m8 for warranty screen replacement with htc

I unlocked bootloader with HTC.dev token and gained s off using sunshine and flashed viper, two days later I broke my screen. Called htc about the advantage screen replacement and have to send it in to them. So anyway I've gone back to my stock back up but I am confused on wether or not I have to update firmware because I was up to date. I was having trouble flashing the ruu so I can ota. Please help if you can any help would be great