[Samsung Galaxy S8 Guides, News, & Discussion] yojosefo:
Hi everybody, here is a little comprehensive guide on how to change your CSC for the Galaxy S8 & S8+.:good:

It all started when I noticed I could not use Samsung Pay (Spay). Bit by bit managed to work up some theories on how to do it on any device.

CSC(Consumer Software Customization) denotes a specific geographical region or carrier branding of your phone. Samsung verifies this in order to allow the use of Spay.

Some important notes:

1.	Your phone will be wiped clean in the process, so backup important stuff.

2.	Not sure if all countries support Samsung Pay.

3.	Avoid partial firmware flashes, they can mess things up.

4.	Be really careful picking up the right files for this process.

5.	This will not trip Knox.

6. This method might work on other S8/S8+ variants, feel free to test it.

7. Most roms are Multi-CSC, so straight flashing it might not work and you can end up with another unwanted CSC.

8. You can use this guide to upgrade/downgrade from Nougat/Oreo.

Let’s begin: There are two scenarios we can start with…

1.	Nougat/Oreo with Bootloader V1

2.	Nougat/Oreo with Bootloader V2

About your Bootloader version:

Early 2018 Samsung launched a bootloader update (V2) mainly to fix Spectre and Meltdown vulnerabilities, as according to this XDA post. For what I know, there is no way to downgrade your bootloader version so far, so be careful selecting the files when changing your CSC.

I noticed a quick tell sign to know if your bootloader is already in V2: If you see the legend “Volume Down Key + Power Key for more than 7 secs: Cancel (restart phone)” at the bottom of the screen when in Download Mode, you are already in V2 bootloader. Otherwise you may still be in V1 (Which is way easier to find files for).

Recommended sources for the required files:

1.	Firmware: SamMobile S8-S8+, Updato

2.	Combination File: Firmware Gem Flash S8-S8+, Easy Firmware (I found Bootloader V2 Combination file here)

Required files:

S8 with Nougat/Oreo and Bootloader V1

•	A Nougat/Oreo Firmware containing the CSC that you want, and still containing V1 Bootloader: This can be distinguished in the name of the file/firmware version, it should have G950FXXU1 on it (U1 is for Bootloader V1).

•	Combination file specific for V1 Bootloader: This can be distinguished in the name of the file, it should have G950FXXU1 on it (U1 is for Bootloader V1).

S8+ with Nougat/Oreo and Bootloader V1

•	A Nougat/Oreo Firmware containing the CSC that you want, and still containing V1 Bootloader: This can be distinguished in the name of the file/firmware version, it should have G955FXXU1 on it (U1 is for Bootloader V1).

•	Combination file specific for V1 Bootloader: This can be distinguished in the name of the file, it should have G955FXXU1 on it (U1 is for Bootloader V1).

S8 with Nougat/Oreo and Bootloader V2

•	A Nougat/Oreo Firmware containing the CSC that you want, and still containing V2 Bootloader: This can be distinguished in the name of the file/firmware version, it should have G950FXXU2 on it (U2 is for Bootloader V2).

•	Combination file specific for V2 Bootloader: This can be distinguished in the name of the file, it should have G950FXXU2 on it (U2 is for Bootloader V2).

S8+ with Nougat/Oreo and Bootloader V2

•	A Nougat/Oreo Firmware containing the CSC that you want, and still containing V2 Bootloader: This can be distinguished in the name of the file/firmware version, it should have G955FXXU2 on it (U2 is for Bootloader V2).

•	Combination file specific for V2 Bootloader: This can be distinguished in the name of the file, it should have G955FXXU2 on it (U2 is for Bootloader V2).

Steps:

*I will assume you already have the abovementioned files.

1.	Enter download mode by turning off the phone then pressing Vol Down + Bixby + Power, then press volume up.

2.	Flash the downloaded firmware with the latest version of Odin (Available here):

Use the AP, BL, CP and CSC file (Not Home CSC, regular CSC).

Wait for it to boot.

3.	Turn off the phone.

4.	This is the tricky part:

a.	Download 7zip for Windows.

b.	Rename the Home_CSC that came with your firmware, removing the md5 extension and leaving it at .tar, thus making it a .tar file.

c.	Expand the files in a new folder.

d.	Delete a file named “Hidden”

e.	Select remaining files and create a new Tar file with the name of the original .tar.md5 file with 7zip.​

5.	Odin Flash the downloaded combination file on AP, and the newly created Home CSC tar file on CSC.

6.	Boot into factory mode.

7.	Select IMEI option at the bottom of the screen to bring up the dial pad, then dial *#243203855#

8.	Select your new CSC code, and wait for it to install and reboot.

9.	Wait for phone to reboot and clean memory.

10.	Re-enter download mode.

11.	Odin flash the firmware again:

Use the AP, BL, CP and CSC file (Use the recently created file again, the one without the hidden file).

12.	Reboot and setup your phone.

13.	You should be in the desired CSC now.

Regarding S9/s9+ method compatibility:

Not sure at all if this can be similarly done with the S9/S9+, but I would be more than happy to check that for you if you send me a test phone, lol.

Thanks to arthurbxp for all the complimenting knowledge on the matter.

DISCLAIMER:

I am not responsible for bricked devices, dead SD cards, thermonuclear war, or you getting fired because your phone failed. Please do some research if you have any concerns about this method and before flashing/using it! YOU are choosing to make these modifications, and if you point the finger at me for messing up your device, I will laugh at you.