How do you downgrade from 5.1.1? - T-Mobile Samsung Galaxy S 5

I have an s5 that came with 5.1.1 completely stock, unrooted with baseband: G900TUVU1FOF6. I have never downgraded an s5 before. I've only done it to nexus devices. Does anyone have any instructions on how I should downgrade it? I was thinking of using the 5.1.1 rooting procedure that involves flashing a kernel with kies then maybe it would be possible to flash a custom 5.0 rom with recovery. I'm not sure that is a good idea though because I wasn't sure if the bootloader, CSC, or PDA firmware would still be stuck at the 5.1.1 version.
Edit:
I found this video which seems to say you don't need to root. I'll try the video's method. https://www.youtube.com/watch?v=Nek0lowlMmM

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[Q] S3 root, please helps

i have the International version,
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Rooting has nothing to do with what firmware you can run.
so YES you can be completely STOCK with a Rooted Phone!!!

[Q] Restoring stock firmware

Hi
I've installed the CyanogenMod following the instructions from the link below and flashed the bootloader to the US ICS bootloader as recommended. Everything worked fine, although I'll thinking about upgrading the tab and restoring it to stock.
http://forum.xda-developers.com/showthread.php?t=2074202
I've found the stock firmware on the Sammobile site, although will this also revert the bootloader or do I need to install the UK bootloader and then restore the stock firmware?
Thanks
Flashing stock firmware will also install a bootloader, so there is no need for you to flash it again.
Thanks for the help :good:

[Q] Flashing CM 10.1 on Verizon Note 2

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[Q]Make stock rooted Firmware(Samsung Galaxy s5)

Hey all
5.0 has been came out to galaxy s5.
I want make stock rooted Firmware to flash with mobile odin to keep knox 0x0(other tools like towelroot dosent work in 5.0)
I have this Firmware http://www.sammobile.com/firmwares/download/44600/G900FXXU1BOC7_G900FOJK1BOC2_ILO/ that come to my OTA update, this version inculde many improves to my language, how i can make this version rooted(only root, no other things) to flash.
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How to downgrade from Android 6.0.1 to 5.1.1

Hello
I flashed the latest firmware available for my S6 edge (SM-G925F) : G925FXXU3DPDP (XEF).
I've never used Android 5.1.1 on my phone and I asks to you if downgrade is possible at this point (latest BL I think) and if yes, how ?
Thanks you for your further replies
Bye.
I Think Once u Flashed The latest Firmware U can't Go back
Because Of bootloader
Bt U can try Download Android LP And boot loader And put Ur phone in Download Mode Flash with odin
i updated on 6.02...
didn´t like it...
flashed back to 5.1.1 stock without problems (odin)
Hello poci,
You were running with which firmware ?
It's easy to go back to lollipop?
I'm reading some comments off people wich say No, ando some less who say Yes.
i made an OTA update from 5.1.1 to 6.0.2... but i didn´t like the battery drain on 6.0.2......(or 6.0.1 i don´t know anymore)
after clean install of 6.0.2....there was no change at all...
then i went back to 5.1.1 by flashing a stock 5.1.1. firmware with odin...no trouble or anything else...
If flash fails, is my device will be hardbricked ???
if you have the right firmware...i would say "no"
so why should it fail?
i used this firmware for my o2 edge
G925FXXU3QOLD_G925FTEF3QOL1_G925FXXU3QOJB_HOME.tar
Beceause newest bootloaders blocks downgrade, you was in which firmware on Marshmallow ?
don´t know exactly...60.1 then
when 6.0.2 blocks downgrade...

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