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Yes, I would predict that to happen soon, as well. Anyways, thank you for this valuable information.

Have the bricked users tried ticking “Re-partition” and “NAND Erase” in Odin’s options (once they’ve supplied appropriate firmware, of course)? Is there any way I can get in contact with them? Such as through a Telegram group, for example.

What do you mean by “it will flash the correct firmware”? How could Download Mode do that?

1) Oh, this seems quite troubling. I’ll try to communicate this through both of my guides by tomorrow. 2) And by “bricking”, a user can’t even access Download Mode? 3) Also, if a user is on a different model number than the original model number they were on, they will brick, correct, if they...

So disabling "preconfig" would prevent that from happening and keep unlocked firmware, unlocked? If so, I'll need someone else to test this, since I don't have any SIM cards for different carriers.

Could you elaborate on what disabling "preconfig" would do? Also, the last time I remembered, flashing the full unlocked CSC file (in additon to flashing the rest of the unlocked firmware) changes your CSC to "XAA", which would be changed to your desired carrier's CSC once an appropriate SIM...

Do you have the drivers installed?

The "UMS" field in Odin is for U.S. carrier firmware that have a "USERDATA" file. Firmware from outside the U.S. don't (normally) have this file.

The reason "NAND Erase" wasn't recommended back then is because partition files (.pit) weren't embedded into the "CSC" files, meaning if you were only to select the "NAND Erase" and "Re-Partition" option and not provide a .pit file, then your phone would brick due to a "NAND Erase" occurring...

I strongly believe that something is wrong with your NAND, therefore I recommend what I listed above (after you read this whole entire post). In the end if it doesn't solve your problems that you've mentioned, nothing bad would happen. The reason you had to use Prince Comsy's Odin to flash back...

With standard Odin (not Prince Comsy's since you're now going to reflash the same firmware), place all of your Canadian firmware files in their appropriate slots and then go into the "Options" tab and make sure that the "Auto Reboot", "NAND Erase", "Re-Partition", and "F. Reset Time" are ticked...

Can you recall if these problems occurred when you were connected to 4g or when you were connected to Wifi? I have a feeling these issues occur since your phone is SM-G955W, yet you tried flashing a U.S. unlocked firmware. I can only verify compatibility with U.S. SM-G955U's.

Yes, you use standard Odin. What error appears under Odin's log that prevents you from flashing it?

The guide has been updated to support users who are on Bootloader v2, in addition to users who are on Bootloader v1! Enjoy. P.S. Please let me know if there are any issues, since I want to make sure everyone can follow the guide easily.

The factory binary works on both unlocked firmware and phones, in addition to standard carrier firmware and phones.

You need to download the Bootloader v2 Combination Factory Binary. It's now in the "Downloads" section. Also, the guide has been updated. So, try to follow where you left off.

This problem has now been rectified, as of 1/15/18 6:24 P.M. EST Please re-download the firmware that is affected by the problem, from the "Downloads" section of the guide. Also, the guide has been significantly updated, for those who haven't noticed. The guide supports users who are on either...

Here you go: http://updato.com/firmware-archive-select-model?record=E9C87532DEBF11E7A5F9FA163EE8F90B I need to really update this guide, since the one linked in the guide is for users on Bootloader v1.

Make sure you're using a Canadian Bootloader v2 "HOME_CSC" file.

No problem!

This is 100% safe and is completely reversible (by following the "Flashing Standard Firmware" section)! And yes, your model number will change from 'SM-G950U' to 'SM-G950U1' if you follow the "Flashing Unlocked Firmware" section of the guide.

Merry Christmas, everyone! To celebrate the holidays, I'm providing a Factory Binary for Bootloader v2! Here it is: https://www.androidfilehost.com/?fid=962021903579500553. Enjoy! :) I'll be updating the guide soon, don't worry.

It will? I need more people to confirm this actually works, as I don't have any SIM cards for any other carrier.

You're most likely on Bootloader v2, since you have Oreo Beta 4. Right now, I don't have the Factory Binary for that bootloader version; therefore, you can't follow the "Carrier Switching" section (yet). If you were to follow the "Carrier Switching" section on a phone with Bootloader v2, then...

I need to acquire an update Factory Binary for users that are on Bootloader v2.

Hey, everyone. I apologize for being gone for so long. I've been extremely busy with school. That being said, if you have any suggestions for the guide, please feel free to submit them here...

Hey, everyone. I apologize for being gone for so long. I've been extremely busy with school. That being said, if you have any suggestions for the guide, please feel free to submit them here...

That looks good. Continue with what I said above.

If you flashed T-Mobile firmware and changed your CSC correctly by following the "Carrier Switching" section, the CSC sequence should now be "TMB/TMB/ATT." Can you please post a screenshot showing the contents of the firmware archive? After you follow my request above and I approve, please read...

I'll be providing that soon.

Try using this: https://forum.xda-developers.com/galaxy-tab-s/general/tool-samfirm-samsung-firmware-t2988647 Make sure you download the latest version of SamFirm and get all of its prerequisites. Then, extract the zip and launch the executable. Enter "SM-G955U" as the model number and "TMB" as...

You've listed the correct order of steps. Knox won't be tripped, as your end result would be stock firmware. Safetynet won't be tripped, as well, as you're not modifying the "/system" partition of stock firmware. Also, as elliwiggy stated, you're last three characters of your CSC code won't be...

Yeah, I've started to notice that Updato has gotten a lot slower. I recommend you use SamFirm to redownload your firmware, as it's probably corrupted. Good luck! P.S. SamFirm downloads directly from Samsung's servers.

As I have to go (and get some sleep), I'll leave you with some suggestions: Try reinstalling the Samsung drivers. Try using a different USB port on your computer. Try using a different USB cable.

Are you using using Prince Comsy Odin or standard Odin? Also, what are you trying to flash?

Hold the Volume Down button and Power button for around eight seconds. Then, once you feel your S8 vibrate (which means it has rebooted), start holding the Bixby button, in addition to the Volume Down and Power buttons you're already holding. You should see a blue screen. Press the Volume Up key...

How come you can't reboot? Try typing in "adb reboot bootloader" in command prompt (make sure you change the directory to the folder where adb is located) to enter Download Mode.

Ok, so you can download AT&T firmware from here: http://updato.com/firmware-archive-select-model?record=EF1356CA26EE11E7963AFA163EE8F90B. For the "Carrier Switching" section, make sure you're typing in this code into the "IME" number pad: "*#243203855#".

I'm not sure of any other ways of unlocking your phone besides through your carrier or a third party. Unlocking your phone is beyond the scope of this guide, however I suggest you try out http://updato.com/unlock if in need of a third party unlocking service.

Sorry about the extremely late response, but you can just flash the unlocked firmware by following the appropriate section of the guide. Changing your CSC to "XAA" would allow your phone to accept any supported U.S. SIM card and automatically change the CSC to that carrier. In your case, you...

I should mention that users should use command prompt, instead of Powershell. In Powershell, you have to put a "./" before the command you want to execute.

The last three characters of that sequence are hard-wired onto your phone. There's no way to change them. You have successfully flashed T-Mobile firmware onto your unlocked phone, however.

If you want unlocked firmware, just follow the "Flashing Unlocked Firmware" section. If you want to switch carriers and get its firmware, follow the "Carrier Switching" section. Then, follow the "Flashing Standard Firmware" section. Your phone can't be locked by your carrier, if you intend to...

If Boost Mobile refuses to unlock your phone, then you'll have to find a third party service that can do it for you. This guide doesn't unlock your phone for use with other carriers.

If you would like to go back to Boost Mobile, after you have changed your CSC code (by following the "Carrier Switching" section) and firmware: follow the "Carrier Switching" section once again so you can change your CSC code back to "BST". Then, follow the "Flashing Standard Firmware" section...

I'm glad that I'm able to help you. For your question, yes, during one of the steps from the "Carrier Switching" section, you are required to flash a specific file from the Canadian firmware through Odin (the "HOME_CSC" file). Just make sure you follow everything carefully, and you should be good.

Actually, you can try putting in a SIM card from another carrier and see if your phone prompts you with an unlock code. If it does, then you'll have to call Boost Mobile and see if they can unlock it for you. My bad.

--snip-- (Look below)

Wait, I'm confused. Are you currently on AT&T or Boost Mobile? Anyways, first make sure your phone is not locked by your carrier (SIM card locking). Then, follow the "Carrier Switching" section so you can change your CSC code (thereby allowing you to use a different carrier's firmware). Finally...

So, you want to change your CSC so you can flash Verizon firmware; am I correct? Then, why would you need Boost Mobile firmware? I have provided AT&T firmware in the "Downloads" section of my guide.