Samsung Galaxy S4 (T-Mobile) - Android 4.4.4 Bootloader Restricts Downgrade?

[ANCUserII]

Hey,

If I understand correctly, if the Samsung Galaxy S4 (SGH-M919) is updated to either: Android 4.3.X or Android 4.4.X; then a restriction is added to the bootloader - preventing the flashing of older stock roms such as Android 4.2.2 (M919UVUAMDL). Is that correct?

In addition, what would I need to do in order to remove this bootloader restriction, so that my SGH-M919 (on 4.4.4 - M919UVUFNK2) would then allow a successful flash to an older stock rom such as Android 4.2.2 (M919UVUAMDL)?

For reference, I have listed the details of my phone below:
Brand/Series/Make: Samsung Galaxy S4
Model Number: SGH-M919
Carrier (Country): T-Mobile (USA)
Android Version: Android 4.4.4
Baseband Version (Firmware/ROM): M919UVUFNK2
Phone Rooted Before?: No

Also for reference, I've listed all the various SGH-M919 stock firmwares/roms:
4.4.4 (2014 December) - M919UVUFNK2
4.4.4 (2014 September) - M919UVUFNH7
4.4.2 (2014 March) - M919UVUFNB4
4.3.0 (2013 November) - M919UVUEMK2
4.2.2 (2013 April) - M919UVUAMDL

-ANCUser