Here is a new tool I created to allow you to easily Lock and Unlock bootloader as well as removing Tampered. If you have S-Off you can simply flash this from recovery and choose your bootloader options.
Guide for using the tool with screen shots can be found HERE.
The Tool can be downloaded here:
**S-OFF is required
Simply install from custom recovery CWM or TWRP.
Make sure you have the latest version of recovery as M7 U/UL TWRP requires at least version 188.8.131.52 for this package to work.
The latest M7 U/UL TWRP can be downloaded HERE.
The latest M7 U/UL CWM can be downloaded HERE.
This should work for Verizon and Sprint as well, however they have different versions of these recoveries, so I am unable to test.