It's make aftar many hard working and few month,i hope it's too easy to any brand flash,and no need to load your desktop space,just open it and work,this software running time maximum 3 minits.
I was trying diiferent Roms and kernels for many days, but no luck gain s-off with "Firewater" (today RIP), have tryed 2 mounth passed with success, so is only a chance for who want to try the same.
Today only "Java Card" or "SunShine" or "BOX" gain S-OFF 100%.
I hope my guide will help you with your phone as well.
I had Sprint HTC One M7 HBOOT 1.57, OS 5.03.651.3 CDMA LOCKED and have done this procedure:
1) Unlock bootloader
2) Flash "recovery-clockwork-touch-6.0.4.8-m7spr" or "openrecovery-twrp-2.8.0.2-m7wls.img"
3) Install Super user
4) Flash "m7wls_Stock_Rooted_5.03.651.3_DeOdex_Full" Rom using recovery
7) Downgared to Hboot 1.44. This one worked for me "hboot_hexed"
8) Install Sprint_HTC_One_m7wls_1.29.651.10_RUU
9) Flash againe "recovery-clockwork-touch-6.0.4.8-m7spr" or "openrecovery-twrp-2.8.0.2-m7wls.img"
10) Install Super user
11) no point 11 becouse who is just to S-OFF can start from step 8, who want to try the same with "Firewater", please use Search button in forum or google for Kernel, hboot itc... or goes directly with "SunShine", (pay somethingh), and start from point 8 too.
NOTE: who is just S-OFF, can istall w/o problem (point 8), Original Sense Stock Rom 4.3, procedure work the same.
OK, now that are S-OFF, Hboot 1.44 and Sprint Version point 8, let's go for UNLOCK this SPRINT CDMA and Abilite for working in GSM modality: