[T-Mobile Samsung Galaxy Note 3] StepLadder Inc:
For those of us that stick with as close to factory as possible...

...some questions regarding the downgrade process where most of our devices (in the Note 3 family anyway) are presently on OB6, there's a mixed consensus online as to whether or not downgrading is even possible going from 5.0 L (OB6) to KK 4.4.x (In our case we're aiming for NE6).

Two important facts come to mind; although many people don't make these important differentiations when discussing the builds on a per device basis; however they're important details:

1 - The N900T and N900A are for all intents and purposes the same device with a few small exceptions:

1A - AT&T via the N900A had offered a Developer's Edition of the device with an unlocked bootloader (no longer offered with release of KitKat and Lollipop) ; whereas T-Mobile did not via the N900T.

1B - Both devices are GSM

1C - T-Mobile's Bootloader was never unlocked, but the Developer's Edition Offered by AT&T was offered with an Unlocked Bootloader despite the hardware of both devices being almost identical.

1D - What works on the international N9005 does not work on the US devices because the chips they're based on are completely different sets (these configurations were also mandatory throughout Europe because of tougher Consumer Protection Laws in the UK and Europe at large than we have here in the US), but it is easier for those of us also versed in hardware, not just software for people to cite the different chips more specifically instead such as citing the "MSM8960" (T-Mobile Note 3 {N900T} Qualcomm Security Chip) and "MSM8974" (T-Mobile Note 3 International {N9005} Qualcomm Security Chip). Please consider this a tip in communication that would also avoid confusion for those not strongly literate in hardware within the developer community because it is easier for everyone to be specific about the chipset rather than get confused about which nickname each chipset received (happens too easily even for those with a lot of experience, we're all only human after all). :D

2 - At present we're using Lollipop OB6, and have left it alone without root; however we prefer to use rooting in the long run because it makes for optimal storage, but because our company is small, we tend to recycle/reuse and as such also need to maintain the integrity of the KNOX service. Our last successful configuration was running MI7 Jellybean; however over time, eventual security vulnerabilities were exploited in that version, so we're intending to stick with L because L also uses some of the OpenSource KNOX code to secure itself.

Please bear in mind that we all also live in a period of out of control economic inflation, so by not spending money on the next newest thing that might have 3 more megapixels on the camera, we're actually saving money, and therefore reducing inflation. We encourage others to do the same when it is reasonable for others to do so. Anyway, I digress on this last part, it's just that helping the economy benefits everyone worldwide, and in the manner suggested; also reduces waste and helps the environment too.

Based on the research, we'll have to downgrade to NE6 KitKat and use Towelroot to maintain KNOX followed by upgrading to OB6; however has anyone actually downgraded from OB6 to NE6 specifically on an N900T (T-Mobile Note 3) from OB6 to NE6 without tripping KNOX or bricking the phone?

I know some of this is a bit verbose; however the details and suggestions above are here, so as to make discussing our query a bit easier, shorter, and sweeter for anyone replying.

Thanks in advance for your help. :D