Question [Q] Rooted original GPE, help updating


My phone is an original HTC One M8 GPE, bought from Google. I rooted it a few months ago, when it was running 4.4.2. I've tried to follow the guide that explains how to update it without losing data.

Here is the link:

I've tried the guide multiple times from my pc and mac. When I get to the part where I am in recovery and I click "install from phone storage" the phone just reboots. At this point I would like to update the phone even if it means wiping it.

Has anyone else had a similar problem? If not, can anyone point me in the direction of wiping the phone to perform the update?