Originally Posted by nkk71 View Post
Solutions for Win 8.1 vary widely, but since you have Ubuntu, use that instead of Win. should work just fine.
Only solution I found for windows 8.1/Fastboot was hboot 1.54.000 from the new 4.4 GPe or hboot 1.55.000 from anything else. After your up to one of those fastboot works as normal.

Here's a Recovery flashable zip of TWRP
just flash it like a rom
Attached Files
File Type: zip TWRP_2.6.3.3_m7.zip - [Click for QR Code] (9.10 MB, 5 views)
HTC One 32 GB AT&T (S-off, Unlocked, Rooted)
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