HTC One won't boot, mount, or flash - T-Mobile HTC One (M7)

Good evening everyone. I have a bit of a conundrum and I'm hoping the community can help. A buddy of mine recently gave me his HTC One (M7) to fix. According to him, he attempted to install the latest GPE rom for the phone (his is the Tmobile branded version) and it failed to install. Afterwards it would only bootloop on the HTC logo screen. I took a look at things and here's what I found:
When I first boot the device I see this:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I can hold down the volume key on reboot and get into the bootloader. This is the screen:
Initially I couldn't even get into recovery. After a bit of futzing around (and installing the HTC drivers) I was able to use fastboot to push CWM touch 6.0.4.6 onto the device. After that, I was able to fully boot into the CWM environment and navigate around. However, when I try to do basically anything that touches the partitions, the device reboots. I grabbed a screenshot of the mounts and storage page:
The top option which you can't see says mount /system.
Initially I thought I could just copy a ROM.zip over to the device and flash it, however, when I attempt to mount the USB storage, it doesn't do anything. I also noticed two directories that I'd never seen before in CWM, the /firmware/mdm and /firmware/q6. It appears that somewhere along the line my buddy attempted to install a different radio or a rom he was using attempted to. In any case, I can mount up the various folders with no issue except for the two /firmware folders. I just get an error. Any time I attempt to format any of the other folders, the phone simply reboots.
I tried also to install a ROM.zip by sideloading with ADB, but the device isn't recognized by my computer when I do so. I've also attempted to flash TWRP recovery, but any time I try to boot into it, it just bootloops immediately.
I've spent days scouring these forums and google in general to no avail. I'm sure I'm missing something simple or misunderstanding some kind of direction, but at this point I'm so frazzled that I might end up chucking the phone out the window. The end goal here is to just end up with a working, booting phone in any way possible. Once I get it to that point I can handle the rest.
Thanks in advance.

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Mr.Moo52 said:
Good evening everyone. I have a bit of a conundrum and I'm hoping the community can help. A buddy of mine recently gave me his HTC One (M7) to fix. According to him, he attempted to install the latest GPE rom for the phone (his is the Tmobile branded version) and it failed to install. Afterwards it would only bootloop on the HTC logo screen. I took a look at things and here's what I found:
Click to expand...
Click to collapse
the phone dosnt have an OS on it and its still on hboot 1.44 somehow.... but you can recover it with a otg cable and a flash drive. you cannot mount the One through recovery. but with an otg cable and a flash drive you can place flashable files on the flash drive and flash them through recovery to get the phone in a working state.
Edit:
this should do the trick. CLICK MEH! you will ahve to obtain S-off ofcourse. jsut put a stock ROM on it then use a s-off method then proceed to do GPE conversion.

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Thanks for the idea. I've got an OTG cable on the way from Amazon right now, so I'll give it a shot when it gets here and report back.