Flash SM-G950U (AT&T) to SM-G950U1 (Unlocked) - Samsung Galaxy S8 Questions and Answers

I just fixed up a Galaxy S8 and want to flash it stock. I am trying to flash the U1 firmware but it just ends up failing. I apparently need to flash something called a combination firmware first? Can someone please provide me some info?

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Anyone Flash Carrier Nougat FW such as VZW, TMB to unlocked SM-G935U Model?

Title says it all. Has anyone flashed successfully the Carrier specific Nougat 7.x FW to the unlocked Edge SM-G935U model?
What are the steps? What functions work/do not work?
Get hold of a firmware and flash it through Odin... since hardware is the same there should be no compatibility issues on that level.

AT&T Unlocked SM-G950U still on August update

So I purchased my S8 from At&t and later got it unlocked by paying the whole amount off. My phone is still stuck in August update and the model number is listed as SM-G950U. I have been told to flash the official firmware with Odin to get the latest update. Which one should I flash? I also don't understand the difference between SM-G950U and SM-G950U1. I only see AT&T firmware on SM-G950U1, should I use that one?
Also, for flashing firmware update on Odin. Do I have to flash all the firmware before the latest one or do I just flash the latest one?

How to Flash G892A to most current Firmware?

The S8 G950U1 is exact same hardware as S8 active G892U. Yet recent ATT firmware ending in CRF5 doesn't flash in modded Odin. I can't understand why. I can only get an older ATT Oreo FW to flash.

Flashing Carrier Firmware to the Unlocked Model

Does anyone have recent experience flashing carrier firmware to the unlocked (U1) model, especially on BL5? Does it still require combination firmware or can I just flash the latest AT&T firmware from Updato using regular Odin?
It would just be regular firmware from at&t. The same way if you wanna flash back to the unlocked firmware. No combination files are needed.

Help ODIN flash US model to newest FW

Hi everyone,
my wife had an S8 + EXYNOS which had its motherboard dead, it was on android 9.0. A phone repair center replaced the motherboard but they had only SNAPDRAGON and everything works fine.
The thing is, that earlier the model number was SM-G955F and now it is SM-G955U and it says now Verizon but it is on android 7.0 and says that there is no update. I want to download the latest 9.0 firmware but I am now confused.
If I search on sammobile for G955U I get only branded firmwares. I see that the unbranded are 955U1.
Now my question is, because I never flashed US models only Europe, should I just flash the latest Verzion FW or can I flash the latest U1?
This is the latest Verizon, I do not want to soft-brick now the phone....
https://www.sammobile.com/samsung/g...e/SM-G955U/VZW/download/G955USQS6DSI4/293814/
If I can use the unlocked firmware, could you please tell me which exactly it is so I do not make a mistake?
EDIT: Followed this easy flash tutorial with modded ODIN and flashed directly U1 unbranded XAA FW which works like a charm
https://www.youtube.com/watch?v=ryrgqbdx49Y

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