[Samsung Galaxy S9+ Guides, News, & Discussion] MeltdownSpectre:
CSC change tutorial for 965F

Thanks to [MENTION=9158318]applepay[/MENTION] and his CSC change method in the S9+ forums, I have tested the guide and posted it with screenshots.

It works 100% as described by the OP, CSC is changed on my device and proof has been given below.

You can use this tutorial to switch to your desired CSC for getting quicker OTAs. However, keep in mind, if you change to a CSC that is different from your home country, you will no longer be able to use VoLTE, WiFi calling and Samsung Pay. Furthermore, doing a factory reset with a SIM card from your home country will revert back to your previous CSC.

This will NOT allow you to register for the beta program.

I would also like if anyone with a region locked device, such as BTU/BTU/BTU could test this tutorial to see if it changes the CSC for them.

Let's start off by saying, I did NOT find this method, I simply used the guide from [MENTION=9158318]applepay[/MENTION] in his thread HERE.

I've added screenshots and proof to show that this works, and to show you how to use RealTerm to change the CSC on your device.

Now, the main purpose of this would be to help those who have region locked devices, however since I don't have one, I can't test this. This will also benefit those who want DBT for example, for quick OTA updates, but don't have a German SIM card to change the CSC using the normal method.

My device is a local Pakistani model so the CSC was PAK/PAK,PAK/PAK. Just for proof, I tried changing it to NEE (Nordic Countries). Screenshots are given below.

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Step 1) Power off your device and make sure to back up all data, since this will require a factory reset. REMOVE your SIM card before proceeding further.

Step 2) Boot into download mode, and flash the combination file for your device. I had a v2 combination file for S9+ already, so I flashed that.

Download link for v2 combination file for G965F - AndroidFileHost

Your device should look like this while booting:

https://imgbox.com/v7ajO7iW

Step 3) Fire up RealTerm and connect your phone to your PC. Once booted into the combination file, it will say either SM-G965F or SM-G965F [DS] if it's a dual SIM device.

Should look like this:

https://imgbox.com/9ZdRS0BJ

Step 4) Click the 'Port Tab' on RealTerm, for me it showed Port 8 = \ssudmdm0000, if this shows up for you, it means your device has been detected by RealTerm, then set the Baud rate to 230400

Screenshot:

https://imgbox.com/OpwRG4qD

Step 5) Go to the 'Send' Tab on RealTerm, enter 'AT' and hit the 'Send ASCII' button, you'll get this as a reply:

USB READY
BOOTING COMPLETE
AT

Screenshot:

https://imgbox.com/1ky52t8k

Step 6) Enter 'AT+PRECONFG=1,0' and hit 'Send ASCII' again, you should get your current CSC as a response, in my case it is PAK.

Screenshot:

https://imgbox.com/iZgiAkqg

Step 7) To change your CSC to your desired CSC, use this command 'AT+PRECONFG=2,???', replace ??? with the CSC you want to install on your device. I chose NEE, so my command looked like this: AT+PRECONFG=2,NEE

Screenshot:

https://imgbox.com/yTAo0uGI

Step 8) To confirm your changes have been applied, type this command to test the current CSC, 'AT+PRECONFG=1,0', your response will look like the message in the screenshot below:

Screenshot:

https://imgbox.com/u2LjnmZU

Step 9) Go to SamFirm, type SM-G965F and download the latest firmware of the new CSC which you have applied. Flash in Odin with AP, BL, CP and CSC_OXM and your device will reboot. Since the CSC has been changed, first boot will take a little longer than usual.

Here is my device with NEE CSC instead of PAK:

https://imgbox.com/wxgDhgdy

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Credits for discovering this method go to [MENTION=9158318]applepay[/MENTION] and 'HD Voice' from this thread:

https://xdaforums.com/galaxy-s9-plu...change-s9-s9-csc-model-csc-t3870836?nocache=1