yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
In order to get OTA csc and product code need to match...I think I said that right..lol have said it so many times I'm confused. You will not see oem unlock on US Snapdragon because the bootloader is locked.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] I-Siamak-I:
Hey guys, I have a Note 20 Ultra 5G Unlocked which I purchased directly from Samsung US, if I wanna do a fresh install using Odin and still get OTA updates, which firmware do I use? I'm using T-Mobile sim btw

Spoiler content hidden.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
If you are just looking for clean install just flash the unlocked firmware you are currently on. If your not concerned about saving data just factory wipe. But to me a clean install means just that, so when I clean install I flash AP..BL..CP..CSC and not HOME_CSC that keeps data
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] I-Siamak-I:
so just to be clear I will use N986U1UEU1CTL4 in the first Page and load AP, BL, CP and CSC, correct?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
Yes....flashing csc will wipe device. If you flash home_csc it keeps data
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] TabletGeek:
Thank you @butchieboy. In order to cause the OTA and CSC product codes to not match, would you recommend flashing the U1 version of AP, BL, CSC, and the U version of CP and USERDATA (versus the opposite combination of U and U1 files) in order to ensure the correct radio bands are retained for TMO 5G? I have no issue with losing the obnoxious TMO startup tone and magenta screen. However, I would like to keep the correct TMO radio bands, Visual Voicemail, VoLTE calling, etc.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Mr.DiVANYC:
if I flash the unlocked to a locked, will it brick my device?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
No, bricking your device (like it was in the Old days) is REALLY REALLY REALLY hard to do
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Mr.DiVANYC:
ok ok ok...I did it! I flashed my N986U that I got from AT&T to N986U1 and got rid of all reference to AT&T. Now I'm T-Mobile Unlocked, on Android 11 UI 3.0! Pulling down 76.9/47.1 here in Charlotte...WooHoo!

Now I'm going to do the same thing to the T-Mo locked variant I bought from them!

Thanks man!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
I'm 986U. So I'm not sure about U1. But if I flash U1 on my At&t locked device, I lose advanced settings such as wifi calling and the software update toggle is gone. Hopefully someone with U1 can better answer this. This thread is a wealth of knowledge.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] I-Siamak-I:
This might be a noob question but can I flash my US unlocked Note 20 Ultra that has the firmware "N986U1UEU1CTL4" with T-Mobile Rom "N986USQU1CTL2"??? what is the side effect of doing so since I'm already using T-Mobile Sim? the reason im asking is I don't have Native RCS in the Samsung Messages App and I read that those of us with unlocked Note 20 Ultra can get around this by flashing T-Mobile rom.

Can I get back to unlocked Samsung ROM if things don't work out?

and the whole process is the same going back and forth between roms? just use Odin right?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
Yes you can flash. As long as bootloader is the same you can. Going back is the same way. All of this has been answered numerous times🤪
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] elruco:
Merry Christmas Guys and thank you for the reply's...so today i stop at best buy and pick up a USB-C to USB-C cable , and i was able to flash the CTL4 file , remember i had the phone bricked...so thanks to you guys advise to not use the original charger cable cause that was my problem...Thank you very much....so i have the phone on and i put in my sim card from T mobile but im getting this Error[ Sorry, your device cant be activated on another carriers network right now and to call the 1800 numbers.

so my ? its this CTL4 its a stock firmware, its not to unlock the phone to another carrier..

please let me know and thank you so much i was worry that i fup???? the phone loll

and forgot to let you guys know that my phone its from Verizon carrier en model...SM-N986USQS1BTJ8
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] unitz0mbie:
Yes this is true. My att device is currently U1. But I'm on one ui 3.0 beta 4. And I have wifi calling. One u.i 3.0 adds wifi calling. Everything is working as intended.

The only thing I can't get to work is RCS with the work around. Sometimes my messages won't send
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
You could always use Google Messenger
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] dottat:
Not for T-Mobile it won't.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] elruco:
Hey, fellas, I install the N986U1UEU1CTL4, turns it on and it unlocks, I insert the Tmobile, and I could make phone calls and it says Tmobile but after 10mnts comes back to the error Change carrier device cant be activated on another carrier....any ideas, please...I install BL, AP, CP, CSC not user data...its that could b the issue..
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] imanony:
Gurus a quick question. I want to start off fresh on my TMO version by flashing the same version(CTL2). I did same on my Note 10 plus as well. The question I have is what is the USER_DATA file for? Should I use that as well along with AP, BL, CP and CSC?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] dottat:
What model is the phone?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] elruco:
Note20 ultra Verizon carrier
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] dottat:
Doesn't sound like they unlocked it for you yet. Did you confirm with Verizon they unlocked it?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] elruco:
no it's not unlocked....I just could use it with Verizon..

so this firmware that I'm installing won't unlock carrier
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] dottat:
No it will not. You need the carrier that provided the phone to so that.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] elruco:
ok thank you....so there's no fw that would unlock a carrier
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] dottat:
Nope.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
Have a great New Year everyone. Thanks for everyone's contributions to this measly little thread
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Jobudden:
Q

Same to you man! Everyone stay safe!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
Same to you my friend/friends. Thanks for putting up with this old man. Sitting at home with the wife watching Netflix
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] elruco:
same to you and HAPPY NEW YEAR.... and thank you for u guys' help...
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] I-Siamak-I:
Guys, While Flashing using Odin, If I wanna make sure my phone is fully wiped clean, do I check "Nand Erase" and "Re-Partition"??
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
NO, Don't mess with them. When you load Odin, use the BL, AP, CP, CSC (NOT the HOME CSC), and USERDATA
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] I-Siamak-I:
So by using those 5 options it will fully wipe my device? Because I used BL, AP, CP, CSC and my device did not wipe at all
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
Yep, and you can always go beck into recovery and do it again if you want
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
Actually, are you on TMB? If so, go into recovery before flashing, do the Factory Reset then flash the firmware. You can also reset in Settings too
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Geekser:
Next time don't choose the HOME CSC file, choose the other CSC and it will wipe your device.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] I-Siamak-I:
Im pretty sure I used the normal CSC not Home CSC but I'll try it again and see how it goes
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Jobudden:
I'm on using Verizon this. Its nice to get rid of their boot screen and their sounds.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
For those who've moved to Android 11, you'll notice that in Device Care that you'll have no battery history. It broke after new years. To fix it, go to Setting>Apps (be sure to show system apps)>Samsung Device Manager Services>Storage>Clear Data. It'll obviously take time to register your history again
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] elruco:
hey fellas I'm trying to get these files from AP and BL any ideas....cause every time I try to extract it's asking me for a password does anybody knows the password..

I'm trying to remove the FRP lock..
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
That's for the N975FXX, sorry I don't have any info on those firmwares.

Edit.... Oh, I see those are your examples. Sorry, no I didn't know any of the firmware was protected
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] mojicacarmelo:
Did you update your ATT device to U1 3.0 (not betas) the stable version and manage to keep the features from ATT like wifi call and advance features trying to get more info before i flash my ATT "U" device thanks in advance
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Geekser:
I updated to the January Security Update - N986U1UES1CTL7 - via Frija - I just wanted to make sure you know the updated January firmware for U1 is available now. Hope that helps....

One quick note - when I first flashed the N986U1 Firmware for January, I noticed that I did not get WIFI Calling (like I had when I was using the BETA Firmware for Android 11) So, I simply flashed the CSC (Home) file from the latest N986U Firmware and WIFI calling was there when I rebooted. (I am on ATT for what it's worth)
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
I'll get a link posted in a bit
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Compusmurf:
"One quick note - when I first flashed the N986U1 Firmware for January, I noticed that I did not get WIFI Calling (like I had when I was using the BETA Firmware for Android 11) So, I simply flashed the CSC (Home) file from the latest N986U Firmware and WIFI calling was there when I rebooted. (I am on ATT for what it's worth)"

I didn't know you could do that without wiping something....

Would this "gain" me anything on TMObile?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
U1 CTL7 link posted in the OP
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
Has anyone noticed that battery stats are not working since 11 update. I mean I freaking hate the built in stats, but just curious if anyone else noticed.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
This what mine shows
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Venom0642:
Check your Galaxy store there's and update that fixes it.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
Check out this post
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
Ok thanks. Haven't been here for a bit
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
I was going to re-write it, but I'm feeling lazy today and had enough energy to say "Here's a link' :D
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] wrecklesswun:
CTL2 is for TMO/ATT and CTL4 for VZE on the U1?

running ctl2 now for att and i have wifi calling but not native video calling.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
As far as I can see USC is still on ATK1, TMB is on CTL4, CCT and SPR are on CTL7. I don't know about AT&T or VZW
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] pimpmaneaton:
Just got an Ota with Verizon to go to CTLA.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Jobudden:
Just read the update on my wife's Verizon Note 20 and it states that their update enables RCS
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Jobudden:
Ok so this is pretty weird. I just got the OTA ctl7 update on my Verizon note. But my Samsung messages doesn't look the same in the options menu as her Verizon ato update. I don't have the option to enable RCS. But she does 🤣🤦🤷
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] pimpmaneaton:
Are you on U1 firmware by chance?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Jobudden:
Yea
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] pimpmaneaton:
That's why, out of the box getting RCS with Verizon on U1 has never worked. I'm not sure if accessing the IMS settings and turning that all on will make it work now where they support it. I may try it thus weekend if I get time as I would like to go back to U1.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Jobudden:
I'd like the stay on U1 and get rcs working as well.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Haunt3r:
Wish they would fix the quick actions on notifications in the shade...I use them a lot and it's really frustration having to close the shade and then re-open it just to use a pull down action. :(
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Venom0642:
Link to Firmware N986USQU1CTLA Verizon Second December Patch

Link: https://www.androidfilehost.com/?fid=17248734326145710233
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
Thanks Venom, have a link posted in OP
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] netnerd:
i'm using TMO csc on TL2, after i flashed this. i keep getting random reboot. going to flash back to TL2.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
Something probably is corrupt in the flash. I would do a factory reset before flashing. CTLA WILL work on your device
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] TechGoon954:
Anyone get this today on TMB?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] adj998:
Got the update yesterday, surprised it was OTA since I got impatient and flashed the CTL2 firmware from T-Mobile and got updated to CTLA from Verizon. Battery life has been amazing but I seem to not get 5G as much anymore but nothing to really complain about
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
Hope everyone is doing well. Things have kinda slowed a bit. Got my old Nexus 6 out was flashing roms like crazy. 6 yr old phone still getting new roms
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] netnerd:
thanks for letting us know.

i just updated to TLB
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] chkn:
On TLB now. I am now able to add Nickname to chat.

On unlocked on TMO

I guess this is my last update with the N20U.

See you guys in the S21 ultra spot next month.

Cheers!

Stay healthy .

I thank all the Mods.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Venom0642:
Will upload later i have the Odin files forgot to upload it yesterday.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] TechGoon954:
Thank you sir!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Venom0642:
Np keep and eye out , most likely someone else will post it before me, but i will still upload it later after work.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
Thanks Venom, I did get it uploaded and the link to CTLB is in the OP
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] DPretzelK:
I don't know if it is supossed to happen but... I received an OTA Update from N986U1UEU1CTL4 to N986U1UES1CTL7, but If I'm right I shouldn't be able to get OTAs, since my phone was an N986U from USA AT&T, but I never introduced an AT&T SIM and neither got one, my carrier is TELCEL, and I moved from N986U to N986U1 to keep it AT&T Bloatware free since I can't use any of his "enhanced" features because I'm from México.

Even better, after the OTA I noticed and I'm able to connect to 5G, got VOLTE and Videocalls, the only thing I'm not seeing is the strange SMS thingy that everyone is looking for, but since I'm not interested on that feature or actually any of the ones I just got, I'm not looking forward to found a way to enable it.

Thanks for all the help Kangi, seems like everything went better than expected. :D
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Venom0642:
Here's a Mirror Link to N986USQS1CTLB https://drive.google.com/file/d/17Hk25zrvhX6Js2tifsM-oLU7GmOhI8Us/view?usp=sharing
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] BredzProh:
Hello everyone! I made a tutorial regarding flashing the latest updates:

1. Download and extract both Frija and Odin.

2. Launch Frija.

3. Check the "Auto" button. Write your device's Model Number and CSC

(Your model number is at Settings, then About phone).

4. Click on "Check Update".

5. Click on "Download" and choose a folder to save the firmware.

6. After the download is complete, extract the firmware .zip.

7. Launch Odin.

8. Click the "BL" button and select the file that starts with "BL_...".

9. Click the "AP" button and select the file that starts with "AP_...".

10. Click the "CP" button and select the file that starts with "CP_...".

11. Click the "CSC" button and select the file that starts with "HOME_CSC_..." (Selecting CSC_... will wipe your data!).

12. Turn off your phone.

13. Boot into Download Mode by holding both Volume Up + Volume Down buttons and then connecting it to your PC.

14. After booting into Download Mode, press the Volume Up button to continue.

15. Back to Odin, click "Start".

16. The flashing process will be over when "PASS" is shown in Odin and your phone reboots. You may close Odin and disconnect the phone from your PC then.

17. Congrats! You have successfully flashed the latest update to your device.

18. After your phone is on, turn it off again.

19. Boot into Recovery Mode by connecting to your PC and holding Volume Up + Power Button (+ Bixby Button).

20. Navigating with the Volume Buttons and selecting with the Power Button, go to "Wipe cache partition".

21. Select "Yes".

22. Select "Reboot system now".

Links:

Odin 3 by Samsung:

Index of /

Frija by invmini:

[Tool] Frija - Samsung firmware downloader/checker

* * * PLEASE UNDERSTAND WHAT YOU ARE INSTALLING TO YOUR DEVICES AT ALL TIMES AND ME AND THE DEVELOPER ARE NOT RESPONSIBLE FOR ANY SORT OF DAMAGE TO YOUR DEVICE * * * Hey Guys :) Frija is a new tool (successor of now depreciated tool SamFirm)...

xdaforums.com

CSCs Cheat Sheet:

List of Samsung Galaxy CSC Country Specific Product code and region they belong to

List of CSC Country Specific code for Samsung Galaxy & various countries, regions, network carriers, model numbers, variants phone belong to.

www.androidsage.com

I hope it helps you! :)
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] russellstriplingjr:
Ok so im a little confused. Im familiar with flashing but, I have a Verizon Note 20 Ultra SM-N986U thats on baseband N986USQU1CTLA. Its sim unlocked. I want to flash AT&T firmware so it can be used on Cricket and get 5G service. What firmware do I use and should it just flash over without doing anything else? Thanks in advance.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] gotojanoo:
Thanks. These are the 4 files i got when I downloaded from Frija for t mobile variant.

Does that looks good?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
Yes those are fine.

---------- Post added at 08:39 PM ---------- Previous post was at 08:35 PM ----------

The OTA is not broken if you flash out of order. Sometimes yes but not always its hit and miss. I have flashed versions that At&t did not release and still got OTA. But yes you are on point this does happen.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] NoteGarner2020:
When I download ATT I am getting "N986U1UEU1ATH3" Is this correct link?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] dottat:
Only TMO won't wipe regardless of which CSC you flash. Only att inflicts that torture.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] gotojanoo:
U mean Home CSC and Regular CSC both will not wipe ? That would be great. I can see Odin, which one should I use for Tmobile firmware flash.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] dottat:
On TMO only. I will often flash the other carries builds (minus userdata) and never lose data. I do this because often times the other carriers are ahead of TMO. Never lose my data or TMO features.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] naim1234:
can someone post a step by step on Flashing U1 to AT&T Firmware? Dont care about the few apps/bloat.. just want carrier features to work and I want the step by step so i dont brick the phone! thanks!!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] unitz0mbie:
Flashed u1 on on locked att device. No issues, thank you. And still have 5g
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] auxxtl13:
On page 2 is the att link the same as the second link?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] unitz0mbie:
Do you know if there's any way to get wifi calling back on at&t device?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
Flash (U) csc
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] unitz0mbie:
Will that break ota?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
Is you device U or U1? Thought this was discussed earlier
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] unitz0mbie:
I have a U device and I flashed u1 firmware but lost wifi calling
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
Info on how to do this is everywhere. Are you sure you want U1 firmware? You mention not caring about bloat. People usually flash U1 because it has less bloat.

U1=Unlocked firmware

U= United States firmware carrier specific. And not trying to be a jerk, I just don't understand why so many buy U device but then want U1 firmware. Why not just get the U1 device? Just curious
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] unitz0mbie:
I got $1000 credit from att by switching to them and trading in my old device, I also get att discount through my employer. I would have bought unlocked if I could but this was a good deal for me, better than paying 1300 out of pocket.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
I notice you flashed U1. So which ota are asking about that will be broke? Are you wondering if you will still get ota on U firmware since you flashed U1 to your locked device? If that is what you are asking why not just stick to your U firmware if your concerned about getting ota. I think a ton of confusion is coming in because someone asked about unlocked firmware. I figured I would offer it up to help him out. Some are now flashing this and that without understanding the basics of the firmware and how to flash.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] unitz0mbie:
I know how to flash, I'm asking if flashing the u csc file to get wifi calling will break ota.

It's not a deal breaker for me, I can live without wifi calling. I rather have faster updates and probably will flash again when 3.0 drops. It was just a question since you're more knowledgeable in the subject.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] butchieboy:
The only way to get wifi calling back is flashing U csc. But I do know that once you do that your software update in settings will be gone
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] unitz0mbie:
Thank you sir, I'll just keep regular u1 then. Thank you for your help!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] adj998:
If I'm not mistaken, flash the latest At&T Firmware with the CSC and you should be good to go. I'm familiar with Odin and flashing firmware but it's not like how it used to be in the past
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kangi26:
If the device is SIM unlocked, actually all you need to do is put in the AT&T/Cricket SIM card(once it's active of course). The device should work right away. To get OTA, then you would flash the AT&T firmware in post #2 (CTL2 is the current one)