T-MOUS S-Off on newest hboot 1.57.0000(what I did)
Let me start off with I think I got lucky. Try this at your own risk. I locked my bootloader and turned my security back on for a TMOUS warranty exchange for the dreaded purple tint in camera. I received my replacement only to find out that in fluorescent lighting the replacement HTC ONE M7 had a greenish tint but only under fluorescent lighting. So I am getting another replacement sent for free. This is where my troubles begin. I decided to unlock my bootloader for my original phone again and root it so I can set everything up again for daily use. I got through all those steps fairly easy. FYI: original phone is on newest TMOUS OTA_M7_UL_K44_SENSE60_MR_TMOUS_5.14.531.1_R-4.19.531.10_release_373019xng22l97gj5szmwv. I then relocked the phone and tried to flash RUU Zip M7_UL_JB43_SENSE50_MR_TMOUS_3.24.531.3_Radio_4A.21 .3263.03_10.38m.1157.04_release_336982_signed_2_de crypted.zip in order to achieve s-off again but to no success. Hboot 1.57.000 with S-ON wasn't having any of it I guess.
I unlocked bootloader and relocked bootloader several times trying several different methods to no success. Oh, my recovery was TWRP 188.8.131.52. At some point I realized that if I was going to return this phone I needed to get s-off again to remove tampered flag and actually lock phone instead of relock. I happened to come across a stock rom that I decided to install in hopes of accomplishing S-off. Stock 3.24.531.3 T-Mobile.zip was the rom. Long story. I know. So here is what I did;
Flashed TWRP and gained root using WinDroid Universal HTC Toolkit
Installed Stock 3.24.531.3 T-Mobile.zip ROM via TWRP
Phone would not fully boot past HTC ONE Animation screen
powered down and powered back on into bootloader
relocked bootloader and rebooted bootloader
unlocked bootloader again
Phone now booted completely into the stock rom I flashed
Proceeded to use firewater for S-off
Didn't work first time
Powered down phone by holding power button and rebooted normally
Tried firewater again and to my luck the SOB worked and I am S-Off again on newest HTC One TMOUS with an older Stock 3.24.531.3 T-Mobile rom
I'm sorry if I have no links to anything I mentioned but I am new to this so I don't really know how to link to other stuff I found on the site. Thanks to all the great people whose tools and rom I used to achieve S-off again.