[Q] [HTC One, Google Play Edition] (bootloader) [ERR] Command error !!! topic

Hey, everyone:

I recently succesfully unlocked the bootloader and rooted an AT&T HTC One, but am now having trouble with an HTC One, Google Play Edition.

I'm not too sure if it's the same concept, but every time type ./fastboot oem get_indentifier_token, I receieve a (bootloader) [ERR] Command error !!! message. I've read it may have something to do with an outdated HBOOT?

Does anyone have any advice on getting this to work? Should I try from step one?

Thanks.