Can I downgrade my S5 from Lollipop 5.1.1 to Kitkat?

[Vexsilver]

So I had to finally use my warranty for my S5 with T-mobile. I have the replacement but it came with Lollipop 5.1.1 and not Kitkat. I've started using Lollipop and it's a nightmare. I absolutely hate it and many of my apps are incompatible.

Knowing this, is there an efficient and safe way to downgrade without tripping knox? I did some googling but find more information on 5.0 Lollipop. I'm surprised S5's got that update. I found a few vague threads mainly on 5.0 but nobody really mentioned success with 5.1.1.

 

[nahoku]

Take it to TMO and tell them you want KK on your phone because you don't like LP. Maybe they can reflash it for you if it's possible. A lot of carriers have incremented the bootloader, so reversion back to a previous OS isn't possible. I don't know if TMO has followed suit though.

 

[Rukbat]

Or you can try the TMobile forum on XDA Forums and see if anyone has an installable KK ROM for the S5.

 

[Vexsilver]

What a shame. T-mobile is pretty anal about everything, so I highly doubt it. I will post on XDA as well, thank you.