I have the same problem my AT&T HTC ONE only has fastboot mode working no recovery.
Have anyone an IMG file to flash it in fastboot mode.
DEVICE HT34WW910959
(bootloader) version: 0.5
(bootloader) version-bootloader: 1.55.0000
(bootloader) version-baseband: 4T.20.3218.13
(bootloader)...
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