Galaxy S6 Root status after flashing with ODIN - Galaxy S6 Q&A, Help & Troubleshooting

My phone Galaxy S6 DUOS (SM-G920FD) is rooted and using custom Arcedia Rom. If I flash Samfirware through ODIN, root will be gone or not? What will be the exact status of the phone after flashing? My OTA update will be back or not?

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[Q] flashing with odin galaxy s2

I could not update galaxy s2 via kies so I downloaded the KE7 fiemware and installed it via odin. (It was KE2 firmware I had stock).
I did not root the phone. Will installing via odin remove the warranty?

[Q] Galaxy note 2 I317 Bricked after unroot

I have the AT&T Galaxy note 2 SGH-I317.
At boot the screen sits on the galaxy note 2 logo. I can get to download mode but can not get to recovery mode.
I had just updated to 4.3 and rooted (mistake) and I needed to unroot. I have tried to flash the stock rom but it just keeps doing the same thing. Also the stock was 4.1.2.
I already tried using TWRP via Odin but that did not do anything.
EDIT:
I did some research and found out that knox which comes with 4.3 does not allow downgrade which is what I was doing. So I now think that all I need is a 4.3 stock rom. any links?

Factory reset

Question.
I have sm-j700t on tmobile I am on marshmallow and rooted with twrp..
My question. If I want to return to stock marshmellow
Does anyone have a link to the correct firmware I would flash in oden? So many variants for different carries I don't wanna grab the wrong one..
I want to remove root and twrp and start over
Thanks
http://live.samsung-updates.com/index.php?device=SM-J700T
This the official firmware for your Galaxy J7 (T-Mobile USA)

GSM not working after installing stock firmware using odin SM-G930U XXA

I have a XXA Samsung Galaxy S7 (SM-G930U). I rooted it and then unrooted it because it was very slow after root. Now after the unroot, the GSM is not working. Any solution for this?

Samsung Galaxy S6 SM-G920F

I recently rooted my phone with TWRP Recovery. After i rooted the device my Wi-fi wasnt working so i tried to do a Firmware with Odin and the files from SamMobile but on odin i get this message (boot.img) and it fails.
If anyone can help me, thanks in advance.

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