Bricked HTC One, trying to help a friend

So a friend handed me his bricked HTC One and asked if I can unbrick it for him. I have fastboot and ADB installed and functioning on my Ubuntu box, but I can't seem to talk to the phone.

The phone is bootlooping after what I presume was a failed attempt to root/unlock/flash. Here's what it says:

*** TAMPERED ***
*** LOCKED ***
*** Security Warning ***
M7_UL PVT SHIP S-ON RH
HBOOT-1.55.0000
RADIO-4A.21.3263.03
OpenDSP-V32.120.274.0909
OS-3.24.531.3
eMMC-boot 2048MB
Oct 4 2013,17:31:32.0
FASTBOOT USB

When I try to go into the bootloader menu and chose recovery (or any other option really) it just reboots into the above screen.

When I query from the command prompt:
lsusb
Bus 001 Device 005: ID 0bb4:0ff0 HTC (High Tech Computer Corp.)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

fastboot devices
no permissions fastboot

adb devices
List of devices attached

So basically I feel like if I can somehow talk to the phone, I can push a recovery boot? And restore the factory rom? But so far I can't seem to talk to it.

I tried using a win7 box I have access to but got into a cascade failure situation with malware or something.

Can anyone help or point me in the right direction?

Thanks in advance!

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