Help to unlock bootloader HTC One Google Play Edition topic

I just received an HTC One GPE. It comes with 4.2.2; because of that, I cannot using fastboot with Windows 8.1. Then I let the OTA update to 4.4.2, then I use the command "fastboot oem unlock" but it gives me these error:

Code:

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(bootloader) [PG_ERROR] htc_pg_part_traverse(839):
(bootloader) invalid traverse range
(bootloader) [PG_ERROR] htc_pg_part_read(1029):
(bootloader) htc_pg_part_traverse failed
(bootloader) [DISPLAY_ERR] sp_custom partition: unlock_disp_buf.img_buf r
(bootloader) ead error!
(bootloader) [DISPLAY_ERR] Can not load custom splash!
(bootloader) Loading custom splash failed!
OKAY [ 0.589s]
finished. total time: 0.591s

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Hboot version: 1.54

Extra question: after sucessfully unlock the bootloader, install the custom recovery, which guide should I follow to make S-OFF?