yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] tribalfs:
What does enabling or disabling NR5G PRUNE exactly do? Thanks.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kent0129:
If you enable the NR5G PRUNE, the phone will disable some NR 5G bands based on your CSC.

Disable the prune will enable all the nr bands on the modem.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] tribalfs:
Thanks. However, it makes no difference on the available 5G bands in the Band Selection menu of N9860 unit.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] mellojosh:
It looks like the n9860 support 5g bands 1 and 78, they may also support 41 and 79. What bands are you looking for?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] tribalfs:
These bands are already enabled by default.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] mellojosh:
Yep, not a lot of band variety in your region. US has several though, so our firmware has more that are hidden.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Nastrahl:
Hi,

Do you know how to reset all changes made in case of unexpected action somewhere?

Thanks
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] mellojosh:
On the U1, you can insert a sim from another carrier and get the reboot pop-up and that resets nearly all service mode settings. On the U or U1, you can change the csc to another and then back, that resets most changed settings. You can also reboot into recovery and wipe or reset from the settings menu.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Romans8vs1:
On this step:

Enable DSS

Now that all the bands are enabled, you have to enable the DSS setting. Get back to UE SETTING MENU with Protocol and System options and:

1-Option 1-Protocol

2-Option 1-AS

3-Option 9-Next Page

4-Option 9-Next Page

5-Option 2-NR DSS CONTROL

6-Option 1-NR DSS ENABLE

I do not have the 6th step. It says "NR DSS No Support". I have a Sprint SM-N986U. I was able to do all of the other steps up until this point. Without this option (Enabling DSS), will I still notice any benefits?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] omer musa:
hi

i got note 20 ultra n9860 ~ 4g+ is not working only 4g ....

my csc is tgy ...if i flash a bri rom would 4g+ work .

if u have any other solution for 4g ca enable plz tell me
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] ahmedoxo:
can any one confirm if this code working with android 12
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kent800129:
I don't have US phones and as I know the US model do not have N78.

(Please correct me if I'm wrong!)

If your region has B28 for 4G, then change csc to BRI can get CA combo with B28.

But changing to BRI will blocked 5G band N3 N41 N79

No, there's no method to access Service Mode on Android 12 now.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Kanonyx:
Hey!

US version hardware can have N78 , thats the purpose of this thread ;)
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] tuxfamily:
Hello.

Thanks for this thread.

Sorry to bother but I've read the 10 pages, tried many things, and probably broke few things 🙄

I would appreciate if you can give me some advices.

I have purchased a G988U1 (S20 Ultra 5G USA unlocked) but I'm in France and my operator is "Free mobile".

This provider uses the following bands:

4G: B1 B3 B7 B28b

5G: n1 n28a n78

I can access the service mode with `*#*#276633683782#*#*` but other codes do not work (even the one with the IMEI).

I can follow the instructions on post #1 but it does not seem to change anything for me.

For the LTE bands, it seems ok, but for the 5G, I'm unable to activate any useful bands, specially the n78 (which is the most used by my operator).

So the question is:

- how can I enable only these bands and/or how can I have the n78 enabled?

(or simply could I?)

Also, something that is not clear to me: do these modifications have to be done on each reboot? or (maybe) only when we change the SIM?

Thank you for your help.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Kanonyx:
Hello,

Like you I live in France and I cant manage to get this N78 band.

I thinks its because samsung patched it.

Dont waste your time anyway because with One 4 you wont be able to get that menu ( for now).
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Sword Fish:
I can get to the same screen using *#2263# and I can select all 5g bands, then select Apply band configuration. I then see all 5G bands however when I go out of the service menu and back in, it resets back to default settings. I have tried rebooting also but it keeps resetting. It is like it isn't getting written. Any idea's?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Draiter:
Doing that will not unlock all bands... You can only set the bands your phone supports, plus a couple of hidden ones. All Note 20s are capable of supporting all bands, but they're is a hardware id in the eeprom that sets the particular bands when it loads the mbn modern files.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Culex316:
I don't have a Note 20 Ultra (I have an S20 plus unlocked T-Mobile model (G986U) ), but I still wish to thank the OP for this guide! I live in Panama where we use Bands 28, 2, and 4 on our LTE networks and thanks to this guide, I managed to enable a hidden LTE CA combination (28-2) that I knew existed in hardware but I was not picking up and it was because T-Mobile's CSC bands were enabled and not the hardware defaults.

The setting even survives reboots and I have also tried it with every carrier SIM here.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Sword Fish:
I am not convinced this is actually the case. If I install 986U1 firmware, I get a different set of 5G bands than I do if I install 986W firmware. Because of this, I believe it is in the firmware that you load. If I load the U1, I get no 5G in Canada but I do if I load the W firmware.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Draiter:
The firmware files for the modems, the actual mbn files that dictate which bands open, are identical for the u1 and w model. They may have the same hardware id.. I'm not a pro at this by any means, just sorta figuring things out.

Can you possibly run LiveBoot and get a boot log so I can see which of the mbn configs is loaded. I know on the n9860 549_a_0.mbn is loaded and that dictates the bands...
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Sword Fish:
I will see if I can do that. I know for sure when I installed the U1 firmware, I did not have N66 5G band enabled and thus I could not get any 5G on the Telus Network. When I installed the W firmware, I did have N66 listed as available on the same phone and I was able to access 5G from the Telus Network.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Draiter:
Interesting. It might also have to do with the SW config files that get loaded as well. I can follow the process of my phone but not sure of others. Thanks
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Culex316:
Would a software update like to One UI 4.0 change the bands back to their CSC defaults? I have the T-Mobile CSC on my S20+ and I'd hate to have to go through the trouble of flashing U1 if it means having to restore all the hardware bands.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Draiter:
If by a software update you mean a full firmware update, ap, bl, cp, and csc, then yes it would change it back to its default bands.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Culex316:
Yikes, even OTA updates? That would suck.. going to One UI 4.0 which, from what I'm reading, doesn't let you access service mode and not being able to unlock the bands either.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] jemfalor:
any solution for the service menu?

27663368378
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] imax64:
On One UI 4.0 / Android 12 the service menu 27663368378 or 276633683782 no longer works. dead in the water here
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] PedroDaGr8:
I am on a Sprint/T-Mobile N20U which was just upgraded to Android 12 and I can still access service mode from the Samsung Phone Dialer, it just requires a different code. That being said, all of the menu options related to unlocking other bands just dump you back to the main menu, making access a bit moot.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] imax64:
which CSC are you using?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] PedroDaGr8:
I'm using the stock one which came with the device.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] cyberlion17:
Can you share what the code is? I can't access the service mode through the google phone app
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] PedroDaGr8:
The code is *#197328640# and you have to use the Samsung Phone app (not the Google Phone App). As I mentioned before, many (if not all) of the menu options that would allow you to enable additional bands just dump you back to the main screen, so it isn't very useful.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] toastido:
Try *#2263# It's the Band selection service menu. Choose your active sim (Sim 1 is physical, 2 is eSIM) and then select your bands for your active sim.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] PedroDaGr8:
Thanks but I was referring to unlocking bands which wouldn't appear in that menu previously (such as n2-SA-NSA or N5-SA-NSA).
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] iman_mohammadi:
enabling all bands can be done by QPST for Qualcomm devices,

but enabling 5G on Samsung phones for some carrier should be done at GCF configuration which at Android 10 , 11 was accessible by mentioned codes , but on Android 12 still there is no way as i searched , if someone know how we can change GCF configuration on Android 12 , please share.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Culex316:
Maybe there's a secret code /procedure to access them because they leave those menus there to make testing easier but they also know that people like us like to poke around in there lol.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Culex316:
I just received the Android 12 update for my S20+ and it disabled the hardware CA bands I need for my carrier in Central America. I had originally enabled them using that secret menu code that no longer works, but I can confirm that by using QPST and deleting the "prune_ca_combos" file I got them back.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] jemfalor:
some stupid bug on the xda app..

so how do you connect you
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] jemfalor:
how do you connect qpst to samsung phones?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Culex316:
https://xdaforums.com/t/help-guide-...-users-5g-reception-fix.4163651/post-86304237

Here is the complete guide I used.

Follow it and you should be able to connect to QPST.

Tip: When you open QPST, you have to add all the ports that appear so that the one that is connected to your phone shows up.

Also, be EXTREMELY, but I mean, EXTREMELY careful with what you modify in EFS file explorer, because one wrong move and you can literally brick your phone/render it a glorified Wi-Fi Tablet.

Just deleting the ca_prune_file like the guide says is OK, I tried it myself and can confirm that all it does is enable all the hardware CA bands, but I cannot stress enough: DO NOT CHANGE ANYTHING ELSE UNLESS YOU ARE 100% SURE YOU KNOW WHAT YOU ARE DOING!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] jemfalor:
tested working =D.

/nv/item_files/modem/data/3gpp/lteps/disable_apn_matching

/nv/item_files/modem/nr5g/L2/mac/mac_cfg_validate_ctrl

/nv/item_files/modem/nr5g/L2/mac/mac_cfg_validate_ctrl_Subscription0

could the above be related to GCF whitelisting?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Culex316:
I am honestly not sure. What you could do is copy the files to your computer and look at them from there and maybe figure something out, BUT....modify files at your own risk because I am serious when I say that this program can brick your phone.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] jemfalor:
i just did a QCN backup using QFIL tool.

*#0808#

RMNET+DM+MODEM+ADPL+QDSS+ADB

launch QFIL

Select port

Backup QCN
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] jemfalor:
/nv/item_files/modem/nr5g/L2/mac/mac_cfg_validate_ctrl

/nv/item_files/modem/nr5g/L2/mac/mac_cfg_validate_ctrl_Subscription0

tested changing to null values, restarted phone, no changes to 5g bands
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] jemfalor:
GCF whitelist? by APN or MAC Address? anyone has any idea?

or someone could GCF remove whitelist then QCN backup, then renable back and do QCN backup then compare the 2 binaries
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] jemfalor:
All 3GPP Certifications

www.globalcertificationforum.org
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] iman_mohammadi:
I think GCF is related to Samsung and it hasn't any thing to do with modem configuration that we can change it by QPST. we should find a way for finding GCF configuration on Android 12.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Draiter:
All the snapdragon n20 ultra have the same motherboard. In the bottom image you can see the Note 20 ultra motherboard. All model numbers supported. What differentiates the different models is a solder bridge. I'm the top image you see the U 0 D W. The u is bridged in this instance, making it a Sm-n986u. Further, the motherboard type is detected by the bootloader and sets a board id (6,2,0,-;Machine model: Samsung C2Q CHN PROJECT - SM-N9860_REV07C (board-id,10)), that board id is then detected by the modem bootloader and sets the particular config file to be loaded based on the board id (549_a_0.mbn) in the case of the SM-N9860. This config file then sets the particular bands the phone supports. All n20 U support all the bands, they are just encoded by the board and the software. No amount of tweaking that I know of will get around that. You may be able to open the phone and solder a different bridge, but I'm not sure if there are any files put on the phone during the build, that cannot be overwritten.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] iman_mohammadi:
seems there is a hidden code for going to RF Test on android 12 , please check it by Samsung dialer and share result and its appreciated to tell CSC,

Code : *#73#
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Sean630:
Any news for activating n78 in SM-G998U1 xaa/xaa/xaa android 12? I'm lost
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] snowdaysrule1:
I happen to have quite a few Note 20 Ultras available for testing, including two that work (BL Unlocked, rooted SM-N9860-CHC and a SM-N986U1-XAA) as well as two that are disassembled (SM-N9860-TGY and SM-N986U1-TMB). If you have any hardware questions or tests you'd like me to run let me know and I should be able to make it happen.

P.S. Draiter is correct about the solder markings differentiating the variants but they are not actually bridging any pads to enable features but rather are just manufacturing markings to label which model phone the board is for. I can also vouch that there is more to bands than just software differences. The US SD models have MMWave antennas that the CHC/TGY/BRI models don't have. And as far as cross flashing CP modem files in odin I can confirm that the phones absolutely throw a fit when attempting to flash "incorrect" CP files. There's apparently a version check that occurs similar to BL files in that you can only upgrade modem versions and I learned the hard way that flashing a lower modem revision CP resulted in a phone that booted but would soon display a popup during setup saying "no IMEI/MEID found" followed by a hard shutoff and bootloop!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] royhanks3:
I am absolutely intrigued and hopeful you'd be able to mess around with these phones to see if you can enable any additional bands with the different solder points
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Culex316:
I think there is probably a way to access those menus by entering some sort of secret code, because otherwise they would not have left it there in the firmware.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Culex316:
So, I tried a trick on my carrier-unlocked Galaxy S20+ (originally from Sprint). I downgraded to One UI 3.1 (XAA unlocked version) so I can set all the settings in this hidden menu (enable all LTE bands and remove pruning) and leave them as is so that the changes could hopefully carry over into the Android 12 ROM I flashed.

Didn't work. The very same band prunings occurred as if I had flashed a T-Mobile ROM despite me flashing the unlocked U1 roms and the settings I made in the hidden menu on One UI 3.1 did not carry over into One UI 4.0.

It seems that even on unlocked ROMS there is something in the firmware that checks the original CSC of the phone and sets the "default" band prunings for said CSC, it's frustrating.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] N1NJATH3ORY:
How are you updating after you flash it ? I've noticed my Note 20 Ultra it was on one ui 3.0 i made some changes in the service menu to enable all 5G bands then i did a few OTA now i cant select 4G or below as when i select it simply refuses to change it's like 5G is forced on!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Culex316:
I download regular OTA updates after flashing the XAA ROM to my Sprint S20+.

Which carrier are you using your S20 on? If it's the U.S. version, I believe some CSCs like Verizon (VZW) or AT&T (ATT) change things in the settings menu and do not allow you to simply switch to 4G only like you can on the T-Mobile (TMB) or unlocked (XAA) CSCs.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] N1NJATH3ORY:
Apologies i'm UK based i imported snapdragon Note 20 ultra unlocked via Malaysia its on TGY firmware i just downloaded older firmware as the April patch has a horrible battery drain as overnight i wouldn't even lose 1% now I'm losing 8 to 10% Joke

if i try to put it on 4G the tab pops up but when i tap it does not change it to 4G I don't mind that but now I'm scared if i flash the older firmware as i can't get into the service menu I'm locked out as on one U.I 3.0 android 11 i had no issues soon as i updated it android 12 service menu via phone dialer does not work!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] p4t0:
This worked for me in Android 12 rooted

am broadcast -a com.samsung.android.action.SECRET_CODE -d android_secret_code://27663368378 -n com.sec.android.RilServiceModeApp/.SecKeyStringBroadcastReceiver
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] iman_mohammadi:
can you share the pictures which after this shows up?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] alarme134:
hello, you say at this precise moment that it is possible to change the last CSC (activated id or carrier id) with the root, someone would be how to do it (or rather where the modified files are in the root) ?

thank you in advance
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kvasimodo:
Hey. Hey. If I did a downgrade from Android 12 on my S10 5g with Custom ROM to Android 11 Custom ROM , would it then be possible to activate the 5g network via Google dialer by enabling NR band in service mode? Or would it still not work for me? Right now my 5g network at home on my s10 5g doesn't work! But it's strange that in places where there is a 5g network here at home it doesn't work on my phone, but when I come to Germany a neighbouring country the 5g network works normally there 🤷🏻♂️
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] N1NJATH3ORY:
You need to check the bootloader on your current O.S then check on Android 11 if the bootloader matches up then you will be able to get access to bands via dailer if not then you will not be able to downgrade as i ran into the same issue on my Note 20 Ultra 5G I'm thinking of rooting it as that's the only way now for me!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] kvasimodo:
I have Root now on my s10 5g Android 12 , but that does nothing to help me activate the 5g network!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Romeo Nickolas:
If someone planning to downgrade just to get the band you want to activate on Samsung Note 20 Ultra 5G US unlocked SM-N986U1

Here's the result:

Before:

After:

It only unlocks band n2 n12 n25 n66 and all available bands in SA.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] N1NJATH3ORY:
This is the Samsung Galaxy Note 20 Ultra section of the forum. You need to find S10 section of the XDA-forums and post your questions there!
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] intheb0x:
You should have access to the menus on xaa.

Try my code above do any codes work for you?

Xaa is a super unlocked base so the fact that you are xaa means everything should be open for you
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] intheb0x:
This code also works for me it gets me to the RF test menu directly for band selection and I can confirm when you remove nr5g bands it drops to 4G LTE and when I add all 5G bands it immediately connects back to 5G so they are doing something so I'm curious if we don't leave that page if it connects to another 5G band like a sea band or something I will test later tonight.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] intheb0x:
I'm curious if there's a test mode for developers, that enable all bands I know for a fact there are test Sims so we just need to figure out a way how to either make these bands stick or somehow get a config file to open up all bands if there's some way we could edit the Sim files The Sim configs or the modem files perhaps would do this?

Like I said I heard the dish firmware unlocks all 5G bands automatically out the box.
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Romeo Nickolas:
OMG that's where I get firmware on my phone. And I never tested their tool since I thought it's just an FRP unlocker IDK that there's more on that tool.

And it works on my US unlocked note 20 ultra 5G SM-N986U1 on XAA CSC.

I can now access all ue settings no need to downgrade.

Your post must be on the 1st page!

Thank you very much!

But sadly I still didn't get 5G signal it says Not restricted and I already confirmed that 5G is working on my sim using iphone 12 on n41 band.

Maybe it is because this phone only supports n41 5G anchored on LTE band 41.

My network uses LTE band 3 for the anchor band for n41 5G (Smart Philippines)

Or because I can't activate the DSS on my device?

Is the DSS settings accessible on your phone?
[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] intheb0x:
Awesome stuff man so you're not on Verizon you're on some other carrier and it worked for you? Also are you sure you're not connecting? The thing with Samsung phones what I noticed is that you see it says disconnected there a lot of times you have to have a data connection in order to be connected.

What I'm saying is basically make sure you're outside or have a good line of a signal don't be in the basement while doing this and open up YouTube or some other data intensive app and then go ahead, and turnip the settings to the highest resolution for the video so it really sucks a lot of data you don't have to do this if you have a data plan and you're worried but you can turn it up a little bit but what I'm saying is there has to be an active data connection for 5G to connect otherwise it usually drops down when the connection isn't there.

Also another good way to check you can hit in netmonster , the left hand corner the little three lines there to open up more settings and then click on log instead of live and that will give you a list of logs and it'll tell you if you actually connected to 5G at all or if you're just stuck on 4G tell me what that page looks like.

Also I do have access to NSS controls in my phone