Change CSC of SM-N9860/DS N20U 5G Hongkong Variant

[tribalfs]

UPDATE:
New Method:
Install Google Phone app and key-in *#*#27262826#*#*
Credits to this post.

Hi!

I successfully changed CSC from TGY to BRI and vice versa on my SM-N9860/DS.
From N9860ZSU1ATH1 ROM, I just flashed my unit back to the N9860ZSU1ATGM (stock firmware with July security patch) using Odin and then change CSC using the Change CSC app by Mysterious Dev.

Download Links:
N9860ZSU1ATGM or N9860ZSU1ATGM MEGA Download
Change CSC Windows App

Important notes and instructions:

• Tested only when coming from N9860ZSU1ATH1 TGY/BRI ROM.
• Factory Reset is required when flashing N9860ZSU1ATGM. If you are new to Odin flashing, check this thread first. Use the CSC_OMC_OZS_*** file instead of the HOME_CSC_OMC_OZS_*** on the CSC slot in Odin. You can use the latter but reset is still required.
• After flashing is done and and your phone has completely booted, open the Samsung Themes app and login your samsung account, update the app if ask.
• Before doing the change CSC, do the following first:
  • Enable developer mode on your phone and enable USB debugging
  • Disconnect your phone from internet.
  • Connect your phone to your PC using USB data cable and allow PC connection on your phone once prompted.
• Turn-off your windows PC anti-virus before installing and opening the Change CSC app (the app is being detected as a virus)
• If the Change CSC app is not opening properly, you need to run it as administrator.
• On the Change CSC app, click "Check" > "Connect" > Select "Android 10" > Click "Change CSC". Go to your phone and click "Check out my stuff". Then follow the instructions shown on your windows desktop. Select the 'Android 10' option in the Legal Settings. Select the CSC that you want to test (BRI or TGY) and install. Click "Remove Change CSC" once done.
• Turn-on you windows anti-virus back.
• This will not trip knox if followed accordingly.

Do these procedures at your own risk!

 

[tribalfs]

After changing to BRI, I was able to update my phone to N9860ZSU1ATH1 OTA.
With BRI, I am already getting the 4G Carrier Aggregation on my unit here in the Philippines (which was not happening previously with TGY).
CA makes a significant difference on my unit. I now have 70-125mbps with it. Without it, it barely hovers 20mbps.
I have not tested the 5G yet. I have no 5G signal in my place yet.

 

[evenshop]

Hi!

I successfully changed CSC from TGY to BRI and vice versa on my SM-N9860/DS.
From N9860ZSU1ATH1 ROM, I just flashed my unit back to the N9860ZSU1ATGM (stock firmware with July security patch) using Odin and then change CSC using the Change CSC app by Mysterious Dev.

Download Links:
N9860ZSU1ATGM
Change CSC Windows App

Important notes and instructions:

• Tested only when coming from N9860ZSU1ATH1 TGY/BRI ROM.
• Factory Reset is required when flashing N9860ZSU1ATGM. Use the CSC_OMC_OZS_*** file instead of the HOME_CSC_OMC_OZS_***. You can use the latter but reset is still required. Guide on how to flash samsung ROM using odin here
• After flashing and boot is completed, open the Samsung Themes app and login your samsung account, update the app if ask.
• Turn-off your windows PC anti-virus before installing and opening the Change CSC app (the app is being detected as a virus)
• Before doing the change CSC, do the following first:
  • Enable developer mode on your phone and enable USB debugging
  • Disconnect your phone from internet.
  • Connect your phone to your PC using USB data cable and allow PC connection on your phone once prompted.
• Run the Change CSC app as administrator.
• On the Change CSC app, click "Check" > "Connect" > Select "Android 10" > Click "Change CSC". Go to your phone and click "Check out my stuff". Then follow the instructions shown on your desktop. Click "Remove Change CSC" once done.
• Turn-on you windows anti-virus back.

Do these procedures at your own risk!

Thanks a lot. 5G works in Switzerland (Sunrise) on slot 2 only, but both sim cards can be activated.

 

[aeroengg]

Am I on ATH1 or ATH2? Can I go ahead with changing my CSC using this method. The only reason I would want to do this is to enable call recording.
Will it be changed forever? Will I get updates and what happens when I get an update? Do I still remain with the changed CSC or does it get reverted to the stock one? Thanks & sorry for so many questions...

 

[tribalfs]

Am I on ATH1 or ATH2? Can I go ahead with changing my CSC using this method. The only reason I would want to do this is to enable call recording.
Will it be changed forever? Will I get updates and what happens when I get an update? Do I still remain with the changed CSC or does it get reverted to the stock one? Thanks & sorry for so many questions... View attachment 5098099

You can't get call recording with this ROM.
I think you can get it by flashing the N9860 rom with CHC CSC.

 

[BlinkThinks]

tribalfs

Does this require that your phone should still be on the Aug 1 security patch to be able to downgrade to the July security patch?

 

[aeroengg]

Thanks a lot, you saved me a lot of work.

May I ask what is the point in changing CSC in this case?

 

[BlinkThinks]

Thanks a lot, you saved me a lot of work.

May I ask what is the point in changing CSC in this case?

Mostly to get the latest updates, or for some to get the built-in call recording (Exynos variants).

 

[tribalfs]

Thanks a lot. 5G works in Switzerland (Sunrise) on slot 2 only, but both sim cards can be activated.

Glad it helps. You are on BRI on this, right? It's good to know that 5G works even both sim cards are used.

How about 4G carrier aggregation (4G+)?

 

[tribalfs]

tribalfs

Does this require that your phone should still be on the Aug 1 security patch to be able to downgrade to the July security patch?

We never know yet. We can check it once sept security patch is already available.

 

[tribalfs]

Thanks a lot, you saved me a lot of work.

May I ask what is the point in changing CSC in this case?

In my case, networks issues. As mentioned , 4G CA was not working while I am on TGY, so with the 5G. 4G CA is working now with BRI. Haven't tested the 5G yet. My country uses the same 5G band and freq with Taiwan.

 

[BlinkThinks]

We never know yet. We can check it once sept security patch is already available.

The reason I asked is that I read somewhere that you can't 'downgrade' your firmware once you are already on the Sep 1 security patch. were you on the Aug 1 patch prior to downgrading to the July patch? I'm gonna try this on my Exynos phone, I hope it works as I am still on the Aug 1 sec patch. BTW I sent you a DM. I appreciate your time. Thanks!

 

[tribalfs]

Thanks a lot, you saved me a lot of work.

May I ask what is the point in changing CSC in this case?

The reason I asked is that I read somewhere that you can't 'downgrade' your firmware once you are already on the Sep 1 security patch. were you on the Aug 1 patch prior to downgrading to the July patch? I'm gonna try this on my Exynos phone, I hope it works as I am still on the Aug 1 sec patch. BTW I sent you a DM. I appreciate your time. Thanks!

Not sure, but I think it will work with Exynos going back to Jul patch from Aug patch.

 

[BlinkThinks]

Not sure, but I think it will work with Exynos going back to Jul patch from Aug patch.

I will report here later.

Kindly check your private message. I asked you something about the firmware. I want to share with everyone if indeed I got it right. Thanks.

 

[jacktackle]

Was reading carefully but my question is
CSC changer can change borrowing exynos CSE on Snapdragon? I want to change KOR (KOO) to UK BTU.
Why? This will fix region problems and samsung daily will focus on UK news rather then korean.

 

[tribalfs]

Was reading carefully but my question is
CSC changer can change borrowing exynos CSE on Snapdragon? I want to change KOR (KOO) to UK BTU.
Why? This will fix region problems and samsung daily will focus on UK news rather then korean.

I don't think it will work. Exynos and SD use different modem hardware.
You will have a good chance if from the same chipset.

 

[evenshop]

IT works. Still after updating to the latest firmware (Ota), the 5g mark doesn't show up anymore. Still it seems I'm on 5g given my speed test. Did anyone else notice that?

 

[BlinkThinks]

@Tribalfs I want to thank you for this. Since your guide is for the SD version, I made a thread for the Exynos version.

 

[evenshop]

IT works. Still after updating to the latest firmware (Ota), the 5g mark doesn't show up anymore. Still it seems I'm on 5g given my speed test. Did anyone else notice that?

I confirm, 5g no longer works after OTA update even though csc is still BRI

 

[tribalfs]

I confirm, 5g no longer works after OTA update even though csc is still BRI

Ows! That's absurd Samsung.