yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] TonytotheB:
So I can flash the U1/XAA firmware on this TMobile phone and see what happens?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Scott:
Should be fine. Not sure about WiFi Calling and VoLTE but the device itself will be fine.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] TonytotheB:
Thanks bud. I know I am asking noob questions in a non-noob thread
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jcrompton:
[MENTION=3163377]iBowToAndroid[/MENTION] Just curious -- when flashing ATT, for example if you wanted to go back to the original completely stock ATT firmware , is it even completely possible? Are the TMB and USC firmware downloads the same minus the ATT userdata? If the USC and TMB or XAS (those are the ones I saw) aren't the same then which is the best one for flashing an ATT branded phone?? Thanks

Edit : So I'm a little more confused now because Sammobile just showed up with USA(ATT) U1 firmware --- what is AT&T u1 firmware anyway , since an ATT phone is a U device ??? I think they are just trying to confuse me LOL
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Shuthefrontdoor:
If I'm already on u1 firmware which files do I need to flash just for the update? Bl,ap,cp, and csc? To retain all my stuff? Thanks
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jcrompton:
If you flash all the files but be sure and use Home_CSC instead of the regular CSC it should retain your data
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Shuthefrontdoor:
Thanks, would I need to flash userdata?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jcrompton:
I don't think so -- that's for flashing from one carrier to another
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
All those answers are already in the OP.

1. Yes it's possible

2. Yes they're the same

3. Best one for flashing ATT firmware is ATT files

Nope. USERDATA only exists on U firmware
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Shuthefrontdoor:
I use u1 on Tmo and both wifi calling and volte work
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jcrompton:
Thanks for your time -- I think you got this answered before my edit ..... You seem to have a better understanding on the overall stuff than the rest of us! So what is up with the USA(ATT) U1 files that have shown up on sammobile? I thought the ATT device was a U device (not U1)? And are these the "ATT" files that you are suggesting to stay as close to or return to completely stock??

Thanks again for patiently answering questions
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Shuthefrontdoor:
I think his last part was referring to my question, but I flashed successfully thanks
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
https://xdaforums.com/showpost.php?p=82085549&postcount=33
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] TonytotheB:
Installed the latest ATCH U1 on my TMobile device and all good. The camera is much better. Thanks
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] moisesmcardona:
Installed T-Mobile's ATCM firmware on the U1 without the need to flash USERDATA. Just used Home_CSC and the data did not got wiped (although an "erasing" message showed up for half a second). Went from XAA U1 ATCH to TMB U ATCM.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] TonytotheB:
Does ATCM have the latest camera fixes?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jcrompton:
My understanding from other threads is that it does not have fix
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] masri1987:
Curious Question

I bought a G9810 and G9880 (HK versions) and I live in the US , Do i need to flash TMB (i'm on t-mo) G988U ?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] sonymd:
You cannot flash firmware between exynos based cpu Samsung phone (outside USA) and snapdragon cpu Samsung phone (in USA). They are completely different hardware architecture.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] masri1987:
G9880 is snapdragon ----
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] juvyancheta6602@gmail.com:
How to flash

So I have a S20 Ultra from Xfinity which I paid money to get it unlocked. I had it unlocked and now I'm using it on at&t. Can some help me flash it to at&t firmware? Thanks
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] west2cool:
You can now change your CSC using Samkey. I have changed mines from BRI to TGY today.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
Doesn't matter. You can't flash U or U1 firmware to that model

If it didn't perform the carrier conversion automatically when you inserted the AT&T SIM, then the instructions for doing so are right in the OP
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] fncd:
I switched carrier firmware on my S20+, and am able to get T-Mobile 5G without issue. Also, tossing in that code gets me this:

NR5G: 41-NSA 71-NSA 260-NSA 261-NSA

Hope that helps!
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jeremyvbk:
Interesting, My guess the carriers are disabling the Band support of their competitors. Seems pretty anti consumer. I wonder if there is a way to unlock all bands to be selected. Would be nice to be able to have access to them for the future.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] fncd:
Pretty sure that all of the bands are unlocked, otherwise I wouldn't have been able to get T-Mobile Sub6 5G on a phone that came from Verizon, which is mmWave.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jeremyvbk:
My ATT s20U is only able to see N5 and no other selection. I know the device supports multiple sub 6Ghz bands. I believe even N66 is supported but nowhere to be seen that I have seen. Its as if its dependent on the carrier firmware.

You are also missing N5 which is what ATT, and I am assuming Verizon will use eventually to start
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] fncd:
If that's the case, then chances are that the bands that are enabled / disabled are based on the carrier's firmware that is installed on the device. I didn't check to see what bands were available before the flash. I can always flash it to a stock rom this weekend, but my bet is that when you get the carrier customization that is when the bands are enabled / disabled. Ultimately I am getting 5G on a band that is specific to T-Mobile so it seems that the *missing* bands are just software related and easily changed by a different carriers' firmware.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
Wireless carriers being anti-consumer!?!? *shocked*

;)
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Thor:
Can anyone let me know the best way to change CSC.

Mine is showing as an O2 service provider, even when I don't have a sim card during setup or if I have my virgin media sim card.

Wanted to change it to unbranded if possible.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
This thread is only for U and U1 models
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Jlew7715:
I have searched and can't find it anywhere so I apologize for my noob question. So here it is. I have a Verizon s20 ultra but want to flash the unlocked version so I don't have boatyard. I know which download I need but does someone know where I can find instructions on how to use Odin so I can flash it?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jcrompton:
I use samfirm to download. It's a lot faster for me. Sammobile.com is the best place for me to see the new software that's out
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
There are tons of "beginner's guide to Odin flashing"-type posts/threads here on XDA, in pretty much every Samsung device forum
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jcrompton:
Has anyone updated their SM-G988U to the ATCT firmware?

Any significant change from ATCH
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jcrompton:
[MENTION=3163377]iBowToAndroid[/MENTION]

You are very much more familiar with all of this than I am for sure so I thought I would check your opinion ....

My question is do you see any problems or am potential negative ramifications to doing what I've done? In order to maintain ATT calling features I have flashed the latest U1 firmware while using the U CSC . I have ATT calling features, the device shows U1 and ATT/ATT/ATT

Is this acceptable or are there any downsides? You have said before that the modems or CP files are the same. Thoughts?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
The last Samsung flagship I owned was an S6. So no, I don't really know much about this - at least as far as the real world implementation goes. I understand how the firmware is set up and how the partitions are laid out and how flashing works. But for understanding what real world results can be expected from flashing x firmware, you'll just need to read through my threads
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mr pnut:
Well I've been flashing samsung phones for a while now but right now I feel like a noob lol I have a verizon s20 ultra unlocked using with att, so I flashed the ui firmware with no problems but when I flash the u firmware I get all the way to user data and it keeps failing . I downloaded the U firmware multiple times and it's the same thing. Any tips or help would be much appreciated.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
You're using the regular (non HOME) CSC, correct?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mr pnut:
Yes sir ....
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
Do you get a specific error message on the phone when it fails?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mr pnut:
You know what bro I didn't really look at the error because it put my phone in emergency mode so rushed back to flash the u1 firmware again.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
I would need to know the exact error message, in order to begin to troubleshoot.

Are you trying to flash AT&T firmware?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mr pnut:
Yes the att userdata...I just got home from work I'm gonna try it again backing up my phone right now. Then I will attempt to reflash.

---------- Post added at 08:19 AM ---------- Previous post was at 07:58 AM ----------

So right now I'm on U1 firmware and about to flash U firmware

BL

AP

CP

CSC

AND USERDATA ATT

I will keep u updated.

---------- Post added at 08:34 AM ---------- Previous post was at 08:19 AM ----------

Ok I feel like a fool now lol....so I re downloaded the userdata and it flash successful [emoji1303] so I must of had a bad download on the first one......thank you we are up and running.[emoji1303]
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mr pnut:
Well I can confirm wifi calling is enable and all att features work on the Verizon s20 ultra, and its showing I just got the April 1 update. Can you pull the update of my phone before I updated it?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] moemoe99:
I went from u1 atct to u atcu tmobile software and Odin worked and phone rebooted but now I get an net::err_name_not_resolved when I restart my s20+ on my home screen. did I do something wrong? every time I reboot my phone I get this message and it disappears after a second. please help!
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
There's no way to pull it that I'm aware of, and even if there were, it would only be an update.zip, not the full Odin files.

Doesn't sound like anything I've ever seen before. You used regular CSC and performed a wipe, correct?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mr pnut:
Yes I did it correct the first time but I'm guessing I had a bad download on my side . But everything is good now .thx
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] moemoe99:
I used csc home because I did not want to delete my saved apps and settings and i wiped partition when It was done with odin.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
Then that's the problem. You must use the regular CSC and perform a wipe when switching back and forth between U and U1 - it's not optional.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] moemoe99:
so now just re-download the u tmobile software with odin and use csc instead of csc home and do a wipe partition. or do I have to go back to u1 and then back to u for this to work. and is the wipe partition part correct?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
Reflash the full U firmware, yes. And use the regular CSC. You don't need to worry about manually wiping anything
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] moemoe99:
ok will try tonight
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Jlew7715:
I had the Verizon and flashed unlocked U1 firmware. Everything went fine but now my NFC won't work. Anyone else have this issue or know how to fix it?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] xurmano20:
Hi, I was experimenting some problems (no imei, no sim detected). I tried to reset the phone without results... Today I decided use odin to flash stock firm but Odin is stuck on Prism.img (near to 97~98% complete). Can I unplug and restart the phone?

Odin is in green flashing prism but it is near to 45 min stuck in prism.img....

Help please

Sorry I wrote in wrong thread... I have G988B/DS model but any help is welcome!

Thanks
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
We can't help you. This thread is only for American models
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] sirjes:
Atd6 for sprint g988us is out
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jsanta11:
How's it running?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Kchitown1977:
I haven't noticed any thing different just bug fixes and crap, apparently update coming for s20 series on sprint supposedly to access tmo band 71
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] moisesmcardona:
Probably a dumb question, but can the firmware be flashed on the unlocked model without losing data and network conectivity? Currently I'm on ACTU from T-Mobile.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
If you're going from U to U or U1 to U1, then yes. Switching between the 2 requires a factory reset
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] moisesmcardona:
Strange... I went from U1 to T-Mobile U without losing anything. The only thing I didn't flash was USERDATA, and used HOME_CSC. The only thing I've noticed is that system updates doesn't work, giving me an "Unsupported device" message, but the rest works fine.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] betovanbuuren:
Do you know if i bought a SM-G988U Sprint version (already SIM unlocked), and then download the SM-G988U1 XAA version, and flash it to convert to SM-G988U1, should i be able to use Samsung Pay un Mexico? at that time no sim lock would be and no carrier bloatware / settings.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
U and U1 models are not sold in Mexico, so I don't believe you can add any Mexican debit/credit cards or bank accounts to Samsung Pay that's on U or U1 firmware. I think I remember someone in a different thread mentioning that once
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] betovanbuuren:
Thanks mate, thought that U1 can bypass the region thing, but thats a shame. Since we only have Exynos variant but it sucks
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Rocketjrb:
Brand new at this. I bought a Verizon s20+ from Samsung but I would like to install the stock Samsung firmware. I still plan on using the phone on Verizon. Is there a place or video when there is step by step instructions?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mopartonyg:
Hi unless you want to go to the unlocked U1 firmware the stock Verizon firmware is the stock Samsung firmware.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Rocketjrb:
Thanks for the quick response. Unlocked U1 firmware is what I'm looking for.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] DjRoc:
U1 AFH links not working

Your links for the U1 firmware on AFH are not working. Any other sites that are legit (no viruses)?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mopartonyg:
https://xdaforums.com/s10-plus/how-to/tool-frija-samsung-firmware-downloader-t3910594 Go to this thread and read about this tool. You will also need to learn about Odin flashing.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] think_fast:
ATT S20 Ultra and 5Ge

I just flashed my S20 ultra from ATT firmware to U1 (I got unlocked it first) and I noticed upon setting the phone up again, that it just says LTE+, and not 5Ge... are they the same thing? Or is the 5Ge not working on the phone because its not ATT firmware now?

I know 5Ge isnt 5G, but its still faster than standard LTE.

I am just trying to find out. I switch sims between phones occasionally.

Any help would be appreciated.

Thank you!

p.s. I wish I had read the note about the ATT firmware part, before installing new firmware, i would have backed up the firmware on the phone (if possible) I just had nothing on the phone....
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] strictlyphat:
Got a US cellilar s20 ultra. Flashed over to t-mobile, all files plus t-mobile user data. Everything seems to be working. Just went to download mode and carrier still says usc. Did I miss a step or does this stay as usc because its originally a usc phone.

---------- Post added at 10:16 PM ---------- Previous post was at 09:48 PM ----------

Can u go to download mode main scree , at the top it says csc : xxx

I have a US cellular model that I changed to tmobile. All the tmlbile stuff is in here ,but my csc still says usc on the download mode scree.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] lulu217783:
if you don't mind me asking. where is the guide to flash this firmware? I have a verizon s20 ultra and i'm wanting to go to the unlocked firmware as well.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] ZuluAlpha:
LTE+ is 5Ge. The 5Ge symbol is a marketing gimmick by AT&T in their ads and firmware and is nothing more than fast LTE.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mr pnut:
I need some assistance please.....Anyone with a s20 ultra on att network cam you share the APN with me please. Any help would be appreciated.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
The APN should configure itself automatically. And even so, you can also get AT&T's APN directly from their website - doing a Google search should be sufficient to find it
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mr pnut:
For some the apn the was on here I don't get services I tried multiple already and not connecting

---------- Post added at 10:04 PM ---------- Previous post was at 10:03 PM ----------

And you are correct bro but not my first rodeo lol I only ask for help if for some reason I can't seem to find the problem . But thx tho
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
So when you look in the APN section, there do not appear any pre-configured APNs?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] jcrompton:
Not sure if this help
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] chris5h:
Can anyone help me flash the stock U1 (unbranded) firmware?

I purchased a Galaxy S20 Ultra unlocked from Samsung. I was able to flash the T-Mo firmware, but am desperately trying to get back the factory firmware and am at a loss. I downloaded the U1 / XAA firmware, from Frija but when I try to download it with Odin it tells me <ID:0/004> FAIL! SHA256 is invalid.

Can anyone point me towards what am doing wrong?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] betovanbuuren:
I have an unlocked G988U S20 ultra from spring, and flashed ATD1 U1 firmware, so everything is working correctly, just the caller id & antispam option is greyed out.

Since im using it in ATT Mexico, do you think that if i flash the home CSC file from the G988U (spring version or should i try another?) ATCT firmware this feature would be enabled?

---------- Post added at 05:47 PM ---------- Previous post was at 05:45 PM ----------

Download the patched Odin from the below thread:

https://xdaforums.com/android/software/patched-odin-3-13-1-t3762572

You should be good with it
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
You're not using the correct Odin version
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Pflashflood:
XAA/XAA/SPR to TMB

I recently bought a G988U from a cell phone shop and was told it was "Unlocked" so I put my TMB SIM card in it and everything works except there is no 5G option at all. I was told by a knowledgable T Mobile worker that it was because I had the incorrect Firmware installed on the phone itself. I've been watching a lot of different Odin videos and the process to Flash seems easy enough. In this situation, am I correct in reading that I need to first flash to U1 than to the TMB U Firmware?

I haven't tried anything yet because the phone was really pricy and I don't want to ruin anything.

I've also read in this thread that putting your carrier sim card into the phone will trigger firmware installation.....unfortunately, that didn't happen when I inserted my SIm card...why would this be?

I really want my 5G capabilities but don't want to ruin my phone. Any help would be super appreciative If anyone is willing to give me a step by step or one on one instruction that would be heaven-sent!
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] iBowToAndroid:
If you're using a T-Mobile SIM card, then your Service Provider code should be XAA/XAA/TMB, not XAA/XAA/SPR. Upon inserting your T-Mo SIM, you should have gotten a prompt to apply new carrier settings, and then the code should have changed afterward
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] chris5h:
You guys were right. I used the patched version of Odin and it worked perfectly. Thank you.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Pflashflood:
But what if I didn't get that prompt? I've hard reset the phone multiple times to try to trigger this. My tmobile sin card is in the phone. Should I go and get a new sin card?
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] theteam:
edit: i figured it out

i bought s20 ultra from samsung(at&t) and I am currently stuck on February update. Can I do this and update to latest security patch? If yes, a guidance of what i should do please

thank you
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] mellospace:
I have a question, I have a verizon S20 Ultra which is now unlocked. I put in a t-mobile sim but didn't get the prompt to apply carrier settings when the sim was swapped. The funny thing is that when the phone was locked to verizon, the prompt used to come up but it will blocked my service after a few minutes saying verizon doesn't allow the phone to be used on other carrier. Now that they unlocked it, I no longer get the prompt so I still get the verizon splash screen and probably no t-mobile networks settings/bands so no 5G at the moment, but I do get service and 4G LTE fine with t-mobile.

Back to my question, can I just flash the t-mobile userdata file to get the carrier update settings to t-mobile and the t-mobile splash screen? Or do I need to flash the whole U1 Firmware and then the whole T-mobile U firmware? What exactly are the benefits of doing the whole firmware flash instead of just the carrier update settings (from userdata file) like the S10 series used to do by itself when you inserted a different sim.

Thanks in advance for anyone's help.
[Samsung Galaxy S20 / S20+ / S20 Ultra Guides, News] Electrolight:
I literally just got SM-G988U (T-Mo variant) today. It is an amazing phone so far but I am wondering how you expect anyone to be able to flash firmware when this phone can't yet be bootloader unlocked and rooted?