yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
Of course you can! I have flashed the U1 multiple times as well as the TMB U firmware with the v1 bootloader and back to the W. Currently, my 965W is setup on TMB U1. (TMB/TMB/XAC). You do need to flash to U1 first before you can flash to a U or W firmware. Factory resetting the device before flashing the U1 will ensure you don't end up with any of the Canadian bloat from your carrier. If you leave your SIM in when setting up on the U1 firmware, it will download the settings, apps, APN, etc.s for the carrier associated with your SIM. Then you are good to flash to the U firmware.

Regardless of what carrier U or even the W firmware you flash it to. You will always have to flash back to the U1 firmware first. A factory reset is highly recommended when flashing to U1 to eliminate any carrier related settings from sticking around and converting the device. One of the modded or patched ODIN's is needed to accomplish this as well.

Edit: Here is a link to the files I have successfully flashed. These were uploaded by another user here, bboii86. If you plan on flashing to the T-Mobile U firmware or AT&T firmware. These both use th v2 bootloader. It is not possible to flash back to U1 currently with the V2 bootloader. The TMB 2ARC6 firmware has also been pulled by T-Mobile for an unknown reason. Flashing this firmware is not recommended.
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
Thanks so much for the information. I'm an Android veteran but it's been a while since I've monkeyed with Samsung/Odin. Well that's a relief, now I just gotta find g960w Canadian firmwares to enable wifi calling etc.

But for now I'll flash the latest U1 firmware. Thanks again.
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
Those files are for the Samsung S9+ so I don't think I can use those. I'm downloading the latest ATT U1 firmware and it's unbelievably slow. There's not many files on AFH and all the other mirrors aren't free.

Is there a mirror site or another that I'm missing? My internet is fairly quick here and this might take 6-10 hours depending if it fails or not.
[Samsung Galaxy S9  Guides, News, & Discussion] waylo:
The v2 Tmobile one had caused bricking on some phones. Obviously not what you want.

---------- Post added at 11:16 AM ---------- Previous post was at 11:12 AM ----------

Get SamFirm from this thread here:

https://xdaforums.com/galaxy-tab-s/general/tool-samfirm-samsung-firmware-t2988647

Support has been deprecated, but it still works wonderfully.

When you run it, you'll have to punch in the Model and Region.

For you:

Model I guessed SM-G960W

Region I guessed XAC

This pulls up G960WVLU1ARBG/G960WOYV1ARBG/G960WVLU1ARBG/G960WVLU1ARBG which is still v1 bootloader. File name is SM-G960W_1_20180226185727_xzsx0zhiio_fac.zip.enc4

Hit download. It's really fast compared to any other filehost.

EDIT: Oops, guess you want the U1 version. I think the model would be SM-G960U1 and you can try TMB for region.
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
I'm on Rogers in BC, is there a schema for the region naming? My device is the unlocked variant so it doesn't have the carrier features anyways so I'm really just interested in getting more modern firmware with newer security bulletins. So I guess I should just stick to U1 or W firmware that's slightly newer and stay away from the may/april F releases.

Again, thanks for the info I'm a little rusty when it comes to samsung devices.

---------- Post added at 07:39 PM ---------- Previous post was at 07:27 PM ----------

So the only firmware we can't flash is F correct?
[Samsung Galaxy S9  Guides, News, & Discussion] waylo:
Xac is North America. From the firmware website there's a way to look at all the regional firmwares available for a model so you can line up the country codes that way.
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
You can find the 960U1 firmware here. You want the XAA one. The process and everything is the same. If you search that site also for the 960U firmware, you will get just about all of the variants as well.
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
So from what I've gathered the Telus firmware is the latest we can flash too. I'm on ARC1 and it still has the February security patch but it's a newer build.

Any other firmware that has a newer security patch?
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
You could technically flash to 2ARC6 and higher on another carrier. I wouldn't though. The U1 firmware might be slow to update but it will be get an update soon. The U1 though on Telus will leave you with XAA/XAA/XAC but everything works fine. I just flashed two more this afternoon for friends, one on Fido and one on Telus.
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
The only ARC6 I could find are for the g960f which is the exynos model or is that something else?

I'm using ARC1 g960w Telus firmware on Rogers network and it seems fine.

---------- Post added at 10:04 PM ---------- Previous post was at 10:01 PM ----------

Ok so sammobile says there is ARC6 for the g960u but it's not on samfirm
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
2ARC6 was available for T-Mobile and AT&T. The update was pulled though and the bootloader is v2, which means you can't flash back to U1, so you definitely want to avoid those.
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
Gotcha, ok I'll stay on ARC1 as I think it's newer than ARBG

Edit: I also noticed that flashing the stock Rogers firmware still didn't allow me to enable wifi calling. Hrmm
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
Flashing is kind of quirky to get everything to work. When you flash to U1, a full factory reset is recommended. When you flash from U1 to something like the W or U1, you want to have your SIM in that you plan on using. You will get a blue screen with a white Android that shows up to install carrier related settings, APN, IMS, etc. Just flashing the firmware doesn't always seem to be enough to get all of the settings pre-installed. Have you tried connecting to WiFi to see if it enables WiFi Calling automatically?
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
Yeah I tried all that, there's a piece of software on the phone side that talks to their servers and it sends the SMS fine but errors when registration is taking place. I'll monkey with it later.
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
This is what I get
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
There might be a hidden menu to access and verify the IMS and other settings related to WiFi Calling. I am not familiar with the bulk of Samsung's dialer codes though. I am not sure if Rogers tries to prevent non Rogers software devices from using things like WiFi Calling. I know AT&T does as well as some others. That is one reason I have always liked T-Mobile. Their WiFi Calling stuff has always been baked right into Android thanks to their close partnership with Google.
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
Man if I could be on T-Mobile... *whistles*

You have no idea how badly we get shellacked for mobile costs up here in Canada. It's actually depressing.
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
I know! I have a Telus line and a T-Mobile line. If you want to be even more shocked. Metro PCS (T-Mobile subsidiary) has a plan where you can get unlimited Canad and US calling, global texting and picture messaging, and unlimited data from anywhere in Canada or the US for $40USD, if you sign up for auto pay. No auto pay, it costs you $45. I pay T-Mobile $50 for that but I also get Mexico, which I don't need. Even on my Telus loyalty plan, I only get unlimited Canada and US calling from Canada only, Canada and US testing from Canada only, and 6GB of data for $92. Then you get hit with the GST, which is like getting kicked in the nuts. :P
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
I have to buy all my phones out right now because they'll force me to change my plan. I have three lines + 8gb of data unlimited text and call for 170/month
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
That's not bad for Canada. Every time I upgrade with Telus, they change my plan in-store but then the loyalty department revert it back. Over 4 years, my loyalty plan went up a whole $5 due to slight changes in the loyalty plans. I would get rid of the Canadian number if some of my friends weren't so cheap and on old plans that don't even have national calling or texting. I have considered porting my Canadian number to Google Voice as well but never bothered.
[Samsung Galaxy S9  Guides, News, & Discussion] tempests:
Stock firmware is a little different as it allows the phone to be manually configured to any carrier. If you want carrier specific, I would look for the latest Verizon firmware. Anytime I have flashed a different firmware, say T-Mobile over Sprint, it changes logo screen, installs carrier apps, configures radio and frequency settings, all for that carrier. The only exception is MetroPCS. On certain Samsung phones, it does not flash the MetroPCS logo, more than likely because it is really T-Mobile firmware with MetroPCS bloatware.
[Samsung Galaxy S9  Guides, News, & Discussion] nealrx:
Need help. I have the SM-G960U unbranded but the carrier is locked to SPRINT. Is there a way to unlock the phone to any carrier using this method? I tried flashing the U1 firmware to U device and it locked off the signal. I'm using it internationally, flashed back the U with the sprintware. If i were to install say, ATT or TMO will it give me the option to unlock with unlock code?? I don't know why I can't seem to get anyone to unlock the phone (tried phone stores and unlocking sites). Please LMK what you guys think is the best option to get this unlocked.
[Samsung Galaxy S9  Guides, News, & Discussion] varun.gid:
so i have got an unlocked AT&T 965U phone in Dubai. i know with experience that since im in dubai, the phone doesnt let me do any updates. if i flash the U1 firmware will i get the updates?
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
Where you are doesn't mean you won't get any updates. When an update is available, you can get the update whether you are on the AT&T U or on the U1. Depending on how up to date your AT&T is, you currently might be stuck with the firmware already installed. Go to Settings, About Phone, Software Information, and have a look at the last 5 characters in the Build Number. The latest build for U1 ends in 1ARBG. The 1 stands for the version of the bootloader. If your AT&T firmware has a 2 there, you are stuck with that firmware until U1 is updated to the v2 bootloader because you currently can't roll back the bootloader. If you are on an older AT&T firmware, then flashing to U1 is possible, but the U1 firmware has yet to be updated from the February security patch.
[Samsung Galaxy S9  Guides, News, & Discussion] dezidez87:
I cannot for the life of me figure out whats going wrong. I bought SM-G960UZKAXAA (US unlocked s9). I wanted VZW's advanced calling features so I put SM-G960U on the device (instead of the SM-G960UI, as it should be). I've used the special Odin and stock firmware to revert, and it seems to be successful, according to Odin, but nothing ever changes. Still get the VZW splash screen and other VZW stuff. HELP!?

'<OSM> Checking MD5 finished Sucessfully..

<OSM> Leave CS..

<ID:0/005> Odin engine v(ID:3.1203)..

<ID:0/005> File analysis..

<ID:0/005> SetupConnection..

<ID:0/005> Initialzation..

<ID:0/005> Set PIT file..

<ID:0/005> DO NOT TURN OFF TARGET!!

<ID:0/005> Get PIT for mapping..

<ID:0/005> Firmware update start..

<ID:0/005> SingleDownload.

<ID:0/005> abl.elf.lz4

<ID:0/005> Complete(Write) operation failed.

<ID:0/005>

<ID:0/005> Complete(Write) operation failed.

<OSM> All threads completed. (succeed 0 / failed 1)
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
Have you enabled USB Debugging in Developer Options?
[Samsung Galaxy S9  Guides, News, & Discussion] dezidez87:
I have indeed. I've downloaded 3 versions of the G960U1UEU1ARBG firmware to try, multiple Odin downloads (the special one is the version thats been showing my flashed successful). so i've no clue where things are going wrong.

something that stands out to me. in trying to flash this unlocked version, some of the instructions tell me to use the csc file as opposed to home_csc. I'm ok with that because i dont mind this device being wiped, but it never is successful when i use the csc file. only when i use the home version.
[Samsung Galaxy S9  Guides, News, & Discussion] robikonobi:
The vzw firmware has a v2 bootloader. You cannot return to the u1 firmware because the u1 firmware is still a v1 bootloader. You will need to wait until they releasse a new u1 firmware before you can revert.
[Samsung Galaxy S9  Guides, News, & Discussion] dezidez87:
oh wow. that super sucks.

Well at least i know now. sheesh. Ok. well will it still function like an unlocked device? or is it pretty much a Verizon phone until something else is flashed?

thanks for letting me know whats going on
[Samsung Galaxy S9  Guides, News, & Discussion] robikonobi:
I don't think the vzw firmware alone will prevent you from using another providers sim card if thats what you mean by unlock. I could be wrong but i think you are stuck though on the vzw firmware until they release a new u1 firmware which hasn't been updated since mid march.
[Samsung Galaxy S9  Guides, News, & Discussion] dezidez87:
okok. Y'all think I'll be able to load TMO firmware? I myself am not sure abut the bootloaders and what not. If i were to do that tho (put TMO firmware), will the advanced calling features and international service still work like it should?
[Samsung Galaxy S9  Guides, News, & Discussion] waylo:
No, the TMO is on v1 as well.

They did briefly release a v2, but that was recalled because it resulted in bricking phones. If you can find that, you could try, as the bricking resulted from the OTA updates (not Odin as far as we know).

Just to check, what does it say under your about phones--> software --> baseband version?
[Samsung Galaxy S9  Guides, News, & Discussion] dezidez87:
i dont have it with me right this moment so I couldnt tell ya i believe it whatever the stock VZW S9 firmware is? R16NW.G960USQU1ARBG, i'm sure.
[Samsung Galaxy S9  Guides, News, & Discussion] NightHawkUndead:
I'm in the same boat. S9 is stuck on Verizon because when I updated I had a Verizon sim card in the phone. Now no matter what I do I can't get it to switch to AT&T. Which is what carrier I use. Just gotta wait until Samsung decides to release an update to V2 bootloader. Luckily I use my Note 8 as my primary device anyway.
[Samsung Galaxy S9  Guides, News, & Discussion] MetalPhoenix45:
Hi, I made a video based on this guide. https://youtu.be/II7KjXpsa-E
[Samsung Galaxy S9  Guides, News, & Discussion] adamjeeps:
Sprint S9, factory unlocked before flashing to U1 and trying to flash to Verizon firmware. No matter what I do, it says brand is Sprint and keeps trying to use Sprint network services. All flashes to U1 and U Verizon version appear successful. Any ideas?

When flashing userdata, should I pick the HOME_CSC or USERDATA_VZW?

When flashing CSC, should I pick CSC_OMC or HOME_CSC
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
Never flash the HOME components when converting.
[Samsung Galaxy S9  Guides, News, & Discussion] adamjeeps:
Thanks! This worked! Flashed to U1 unlocked. Inserted Verizon sim. Phone went through some updating of sim settings and I could tell the Sprint stuff went away. The screen that showed Sprint as the brand was no longer there in the settings about phone.

Left Verizon sim card in, reenabled developer mode and USB debugging, and flashed Verizon firmware and userdata and have a fully functional Verizon S9 now!
[Samsung Galaxy S9  Guides, News, & Discussion] ChongoDroid:
Nice, enjoy the phone.
[Samsung Galaxy S9  Guides, News, & Discussion] Jay07jay:
Is there a AT&T U1 link. I flashed the U1 on my xfinity S9 plus and my service is AT&T i just want to use wifi calling but dont want to get stuck on bootloader v2. Are there any links or way to get this without getting stuck on BLv2?
[Samsung Galaxy S9  Guides, News, & Discussion] ajairola:
There is no AT&T U1 firmware as U1 is the model number for the unlocked variant. If you flash this firmware then an older version of the AT&T U firmware you will gain wifi calling without the new bootloader.
[Samsung Galaxy S9  Guides, News, & Discussion] Jay07jay:
Thank you! Can you point me in the right direction for this firmware?
[Samsung Galaxy S9  Guides, News, & Discussion] fzambon:
Hi,

can I use this Odin to flash a 960U ROM into a 960U1 device?

Thank you.
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
Yes!
[Samsung Galaxy S9  Guides, News, & Discussion] fzambon:
Which unlocked Rom you recommend?
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
I grab the images I flash from updato. You can find the U1 for the 960 there more than likely. Downloads are a bit slow but the firmware I have downloaded from there have always worked for me.
[Samsung Galaxy S9  Guides, News, & Discussion] geoff5093:
Any word on when the v2 bootloader firmware for the U1 will be out? I have my S9 running on T-Mobile now but want to move it to the unlocked version.
[Samsung Galaxy S9  Guides, News, & Discussion] fzambon:
i have a 960u1 and using the stock rom.

Do you think is there any better?
[Samsung Galaxy S9  Guides, News, & Discussion] Malnilion:
I understand the cross flashing process as I've done it, but have a couple questions. In order to get WiFi calling is there a particular version you have to use? I was never able to get WiFi calling to activate when I flashed to AT&T and their phone support basically told me to get f*cked. I allowed my phone to OTA update when it was flashed to AT&T, did I need to not do that? I ended up just going back to the U1 ROM.
[Samsung Galaxy S9  Guides, News, & Discussion] ajairola:
Your At&t account will need to have Wifi calling activated. Easiest way(if you dont have an at&t branded Lg or Samsung) to activate wifi calling is by going to a store and asking them use one of the demo phone's imei on your account. Also you need to make sure your sim card is wifi calling capable(google AT&T wifi calling sim card). I've used both versions of the AT&T available firmware on both my unlocked S9 and my Xfinity mobile S9 and both have worked with wifi calling.
[Samsung Galaxy S9  Guides, News, & Discussion] Malnilion:
So I had WiFi calling working on my V30 and was using that SIM when I changed to the unlocked U1 S9. I used it in my S9 prior to loading up the AT&T firmware. Is it possible that they deactivated HD calling (volte) and WiFi calling since my firmware wasn't AT&T? I'm just trying to figure out why it worked for you and not me lol
[Samsung Galaxy S9  Guides, News, & Discussion] ajairola:
It is possible they shut it off. I've never quite understood their system, when I got my V20 they(customer service) had to set its IMEI in the system(versus it being automatically detected) before my wifi calling could be activated. My other at&t line(with a galaxy s7) didn't need the IMEI set and automatically allowed HD Voice and Wifi Calling to be enabled when the sim was put in it. If you still have your V30 I would put the sim back in it and call At&t and have them set its IMEI in their system(less likely for it to be overwritten).
[Samsung Galaxy S9  Guides, News, & Discussion] SEALBoy:
Hey guys is it possible to flash Verizon firmware to a U1 device to get access to all their carrier features (Wifi calling, HD voice, etc)?
[Samsung Galaxy S9  Guides, News, & Discussion] fzambon:
Hi,

So in a 960U1 device, if I flash a 960U At&t my device will be locked again?

And another question, Will I be able to flash again the original ROM if I change the 960U1 to 960U?

Thank you!!!
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
If you mean, SIM locked. No. If you foash to the current AT&T U build, you will be stuck on that build currently because it contains an updated bootloader, v2. You can't downgrade the bootloader. The U1 firmware is still on the v1 bootloader. If the U1 gets an update to the v2 bootloader, then you would be able to flash back to that, but there is no guarantee it will get an updated bootloader.
[Samsung Galaxy S9  Guides, News, & Discussion] calvint88:
Is it possibile to flash an "Insights Study" vzw s9+ to this U1 firmware?
[Samsung Galaxy S9  Guides, News, & Discussion] kushman:
I'm in att if I odin this will this allow apn edit to unlock hotspot also will this have OEM unlock option to gain root access being they have root access for SD devices just need to be able to oem unlock
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
You don't need to do anything to edit APN's. There currently isn't any way to root anybof the North American can SnapDragon S9's and S9+'s.
[Samsung Galaxy S9  Guides, News, & Discussion] kushman:
In stick firm when I try add dun to aon setting it will not allow to save how would I go about fix if I odin this will this allow me to do what I am trying to do. I can deal without root hotspot is hard to take a loss on
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
I can delete, edit, and create new APN's on the U1 firmware.
[Samsung Galaxy S9  Guides, News, & Discussion] kushman:
So if I odin this I should be able to add dun to vpn

---------- Post added at 07:00 PM ---------- Previous post was at 06:51 PM ----------

So if I odin this will it work with att and will this allow me to use dun in VPN settings like now if I wanted delete current att settings will not allow but it will allow to add but once I put dun it will not save
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
You can only flash to U1 if you are on an older version of the AT&T firmware with the v1 bootloader. It is not possible to roll back the bootloader and the current AT&T firmware uses the v2, where the I1 uses the v1 bootloader
[Samsung Galaxy S9  Guides, News, & Discussion] kushman:
How do I know I haven't done any system updates I turned off due waiting for hotspot or root before I do anything

I'm on G690USQU1ARBI
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
That's a good thing! You are on the v1 bootloader, which means you can flash to U1. The 1 in front of the ARBI is the bootloader version.
[Samsung Galaxy S9  Guides, News, & Discussion] kushman:
Ok good deal now if I do this will I be able to set my apn to dun for tether ?
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
Yes. The U1 should install everything you need for AT&T oncr you flash though. If the tether APN isn't there, then you can easily add it.
[Samsung Galaxy S9  Guides, News, & Discussion] FatalONEM8:
https://xdaforums.com/showthread.php?p=76825240

Anyone want to test this that's stuck on V2 firmware with carrier software that isn't theirs?
[Samsung Galaxy S9  Guides, News, & Discussion] fzambon:
960U still no update.
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
How is anyone supposed to fpash a zip when it isn't possi le to load TWRP yet on the North American SnapDragon S9's and S9+'s?
[Samsung Galaxy S9  Guides, News, & Discussion] FatalONEM8:
In stock recovery
[Samsung Galaxy S9  Guides, News, & Discussion] jcsww:
Okay. I haven't tried flashing a zip through ODIN. My S9+ is on U1. I won't upgrade thebbootloader until itnis updated with the U1 firmware.
[Samsung Galaxy S9  Guides, News, & Discussion] FatalONEM8:
Ok. It's not flashing through Odin but rather recovery, you choose update via sd card and select the sec_omc.zip and it just flashes, nothing else required to do it, it's because the zip is signed. That's why it's so easy to flash.
[Samsung Galaxy S9  Guides, News, & Discussion] cjegan2008:
Going to try this myself