Hello experts,

[abdus_selim]

I have bought a Samsung S20 5G docomo (model: SC51Aa) having DCM csc code. As it has so many bloats, I would like to switch to KOO Korean global version. How may I do that? Please help 🙏

@Bruce-Wayne

[أحــمــدالــعــانــي]

Not possible

Japanese model is different from Korean model and from the global model 

[abdus_selim]

But someone did it😮

[Wodehouse]

You want to change the CSC (Country Specific Code) on your Samsung S20 5G from DCM (Docomo Japan) to KOO (Korean global version). This process is called a "CSC change" or "region change."

*Important:*

1. *Warranty:* Changing the CSC might void your warranty.
2. *Data loss:* This process will factory reset your device, erasing all data.
3. *Network compatibility:* Ensure the KOO CSC supports your desired network frequencies.

*Step-by-Step Instructions:*

1. *Backup your data:* Before proceeding, backup your important files, contacts, and data to a safe location, such as a cloud storage service or an external hard drive.
2. *Enable Developer Options:* Go to _Settings_ > _About phone_ > _Software information_ and tap _Build number_ 7 times to enable Developer Options.
3. *Enable OEM Unlocking:* Go to _Settings_ > _Developer options_ and toggle on _OEM unlocking_.
4. *Download the necessary tools:*
- Samsung Odin (latest version)
- KOO CSC firmware for your device (SC51A)
5. *Enter Download Mode:* Press and hold the _Volume down_ and _Power_ buttons simultaneously for 10 seconds. Release the buttons when the screen turns blue.
6. *Connect your device to your computer:* Use a USB cable to connect your device to your computer.
7. *Open Samsung Odin:* Launch the Samsung Odin tool on your computer.
8. *Select the KOO CSC firmware:* In Odin, select the KOO CSC firmware file you downloaded earlier.
9. *Start the flashing process:* Click the _Start_ button in Odin to begin the flashing process.
10. *Wait for the process to complete:* The flashing process may take several minutes. Do not interrupt the process.
11. *Reboot your device:* Once the flashing process is complete, your device will automatically reboot.

*After the CSC Change:*

1. *Set up your device:* Follow the on-screen instructions to set up your device with the new KOO CSC.
2. *Check for software updates:* Ensure your device is running the latest software.
3. *Test your network connectivity:* Verify that your device is compatible with your desired network frequencies.

Please note that changing the CSC can be a complex process, and there's a risk of bricking your device if not done correctly. Proceed with caution and at your own risk.

If this reply answered your query please mark my reply as "resolved" by clicking 3 vertical dots. Thank you 😊

[abdus_selim]

Thanks a lot brother. I have tried but didn't find the koo firmware for my model. So I am curious to know how he did. You can see my comments above showing someone did this in the same phone. If I could contact to him one by one that would be better. So it's not solved yet. 🙏

[Wodehouse]

No issues. Keep trying and you will succeed !!

[samsungsupportt]

Download this https://r.honeygain.me/ROSHA902B8

[Bruce-Wayne · Accepted solution]

According to my research, what I found is:

You can't change the CSC of a Samsung phone that has a single CSC. Your phone, the S20 Docomo variant (SC-51A), has a single CSC: DCM.

However, if you want to install a global ROM like the Korean KOO, you can do so without changing the CSC. When you install the Korean KOO firmware using Odin, it will not change the CSC from DCM to KOO. Instead, it will add an extra CSC code, resulting in something like DCM/KOO/DCM.

I believe the CSC in the middle will take effect, which in this case is KOO. The Korean global ROM also includes some carrier bloatware, similar to the Japanese DCM version.

How to install the Korean KOO ROM on your S20 5G (SC-51A) DCM:


1. Unlock the bootloader.


2. Reboot into bootloader mode.


3. Flash the "AP, CP & CSC" sections using the Korean KOO firmware.

Do not flash "BL," or you'll get an error.

If "CP & CSC" also give errors, just flash the "AP" section. This will install the Korean firmware but won't change or mix up the CSC, as mentioned earlier.



4. Reboot and enjoy! (If you face a boot loop or get stuck on boot, perform a factory reset from recovery mode.)



Please accept this as the solution. I tried my best to explain. Let me know if you need more help.

[abdus_selim]

Thank you brother. But would you please clarify is it possible on Snapdragon variant because mine is SP 865. Model (SC51Aa) . Is it possible?

[Bruce-Wayne]

yes. my SC-51A was also Snapdragon 865.