Question Change CSC from LUX to DBT

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cheekrox

Senior Member
Jun 10, 2011
454
22
Brussels
Can I change my CSC from LUX to DBT by flashing the DBT firmware (minus the HOME_CSC, so i keep my data) ?

I've just ordered credits from Sammkey but I'm wondering what that is even needed if a flash via Odin will also do the trick. I want to switch because I still don't have the update yet.
 

Beefheart

Senior Member
Dec 5, 2007
4,397
1,241
England
Samsung Galaxy S21 Ultra
Download the DBT firmware and flash with Odin. Make sure you select Home CSC. This will put you on the latest firmware but keep data and CSC intact. It's what I did, my CSC is VOD which is Vodafone UK but I'm now on AUE1. Vodafone UK aren't even on AUDA yet.

Make sure you clear cache after installing from the recovery menu.

In short, if all you want is the update you don't need to change your CSC.
 
Last edited:

cheekrox

Senior Member
Jun 10, 2011
454
22
Brussels
Download the DBT firmware and flash with Odin. Make sure you select Home CSC. This will put you on the latest firmware but keep data and CSC intact. It's what I did, my CSC is VOD which is Vodafone UK but I'm now on AUE1. Vodafone UK aren't even on AUDA yet.

Make sure you clear cache after installing from the recovery menu.

In short, if all you want is the update you don't need to change your CSC.
Oh alright. So if I just flash the DBT firmware but with the home-csc checked, then I should be on the update? I'm currently on AUC8. I assume I have to flash the AUC8 version of DBT, right? And then I assume I'll have the OTA to update to AUDA and thereafter AUE1, right?
 

Beefheart

Senior Member
Dec 5, 2007
4,397
1,241
England
Samsung Galaxy S21 Ultra
Oh alright. So if I just flash the DBT firmware but with the home-csc checked, then I should be on the update? I'm currently on AUC8. I assume I have to flash the AUC8 version of DBT, right? And then I assume I'll have the OTA to update to AUDA and thereafter AUE1, right?

No. Just download and run Frija, put the device in as SM-G998B and the CSC as DBT and tick auto. Press the Check Update button then, when it shows the latest firmware, press the Download button. Once downloaded (around 7.5gb) you unzip the file and flash the parts in download mode with Odin, making sure Home CSC is selected as the CSC file. Once installed, go back to the Recovery menu and format the cache partition. Boot the phone and you're on AUE1 with your current CSC.
 

carlitobahsoun

Senior Member
Sep 26, 2012
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beirut lebanon
Oh alright. So if I just flash the DBT firmware but with the home-csc checked, then I should be on the update? I'm currently on AUC8. I assume I have to flash the AUC8 version of DBT, right? And then I assume I'll have the OTA to update to AUDA and thereafter AUE1, right?
u will get ota when lux csc get it .
ur csc detected by ur sim card .
if u have dbt sim card than u will get ota for germany.....
see ur service provider software version..in setting , software infofmation.
 

cheekrox

Senior Member
Jun 10, 2011
454
22
Brussels
u will get ota when lux csc get it .
ur csc detected by ur sim card .
if u have dbt sim card than u will get ota for germany.....
see ur service provider software version..in setting , software infofmation.
What if I don't put a SIM card in while starting? I have LUX csc but my phone is unlocked. I bought it from a store, not the carrier.

So are you saying if I flash DBT AUE1 it's not gonna work?
 

Beefheart

Senior Member
Dec 5, 2007
4,397
1,241
England
Samsung Galaxy S21 Ultra
What if I don't put a SIM card in while starting? I have LUX csc but my phone is unlocked. I bought it from a store, not the carrier.

So are you saying if I flash DBT AUE1 it's not gonna work?

If you follow what I said, it will work. You will remain on LUX CSC and be on the AUE1 firmware in the same way I'm now on AUE1 but retained my VOD CSC.

Up to you though, if you're not comfortable flashing with Odin it's something you maybe best avoid and wait for the OTA.
 

cheekrox

Senior Member
Jun 10, 2011
454
22
Brussels
If you follow what I said, it will work. You will remain on LUX CSC and be on the AUE1 firmware in the same way I'm now on AUE1 but retained my VOD CSC.

Up to you though, if you're not comfortable flashing with Odin it's something you maybe best avoid and wait for the OTA.
Gotcha! Will give it a try.
 

cheekrox

Senior Member
Jun 10, 2011
454
22
Brussels
Screenshot_20210510-114148_Settings.jpg
 

Beefheart

Senior Member
Dec 5, 2007
4,397
1,241
England
Samsung Galaxy S21 Ultra
lol....u see ? u got or will got ota from LUX not DBT .
UR CURRENT CSC IS LUX NOT DBT

Where did he claim his CSC was DBT?

His initial question was asking about changing his CSC to DBT so he can get the latest update. I pointed out he didn't need to change the CSC for that and provided guidance on how to update to the latest firmware, keep his data, and stay on LUX CSC which he has now done.

I think you may have misread the thread.
 
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carlitobahsoun

Senior Member
Sep 26, 2012
3,534
1,425
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beirut lebanon
Where did he claim his CSC was DBT?
he didnt : from his first post ask for changing his csc from lux to dbt , flashing full firmware in multi oxm NOT CHANGE CSC .
iam trying let him be sure that he didnt change his csc .
he bought credit from samkey , than he can change his csc to DBT .
his question was if flash odin do the same trick as samkey , and answer is nope .
he updated yes , but not change csc by flashing odin way.
that what i was make it clear for him.
sorry , didnt misread the thread.
 

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cheekrox

Senior Member
Jun 10, 2011
454
22
Brussels
Hey both,

Thank you both for the clarifications. Indeed initially my plan was to change from LUX to DBT. And I purchased 5eur worth of credits of SAMMKEY.

However, as pointed out by @Beefheart ; the reason I wanted to change was to get the update! And now that I have it, I don't see why I should change my CSC.

Unless of course someone mentions why I should? Some extra benefits? I live in Belgium and have an unlocked S21 Ultra. With LUX CSC, I get VoLTE and Wifi-Calling -- carrier dependent features and also eSIM. Will I get the same on DBT?

Also, will I get DBT OTAs in the future or everytime there's an OTA, I need to flash via ODIN again (so repeat what I did) ?
 

cdyna

Member
Aug 27, 2009
45
15
Hey both,

Thank you both for the clarifications. Indeed initially my plan was to change from LUX to DBT. And I purchased 5eur worth of credits of SAMMKEY.

However, as pointed out by @Beefheart ; the reason I wanted to change was to get the update! And now that I have it, I don't see why I should change my CSC.

Unless of course someone mentions why I should? Some extra benefits? I live in Belgium and have an unlocked S21 Ultra. With LUX CSC, I get VoLTE and Wifi-Calling -- carrier dependent features and also eSIM. Will I get the same on DBT?

Also, will I get DBT OTAs in the future or everytime there's an OTA, I need to flash via ODIN again (so repeat what I did) ?
You will get updates when LUX gets updates. You can keep updating manually like you did just then. I do not know of there is any downside to always writing 7GB instead of 1 GB or whatever the size of the update is. If you already have the Samkey credits, why not use them? I went from VD2 to DBT in a few seconds...
 

cheekrox

Senior Member
Jun 10, 2011
454
22
Brussels
You will get updates when LUX gets updates. You can keep updating manually like you did just then. I do not know of there is any downside to always writing 7GB instead of 1 GB or whatever the size of the update is. If you already have the Samkey credits, why not use them? I went from VD2 to DBT in a few seconds...
Oh right! Great. I shall do that. Although with Samkey, would I need to wipe data? If so, I'd rather not.
 

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    Gotcha! Will give it a try.

    For more detailed instructions for Odin and flashing this, please follow the post https://forum.xda-developers.com/t/...axy-s21-ultra-sm-g998b.4218529/#post-84296141

    It was written or an older firmware, but is still accurate for this.
    1
    Was able to get the update! I flashed the DBT f/w over my LUX f/w. I kept HOME CSC so data is still there. And now it says May 1st update! :D
    1
    Nice one.

    As indicated, make sure you format the cache partition from the recovery menu.
    1
    lol....u see ? u got or will got ota from LUX not DBT .
    UR CURRENT CSC IS LUX NOT DBT

    Where did he claim his CSC was DBT?

    His initial question was asking about changing his CSC to DBT so he can get the latest update. I pointed out he didn't need to change the CSC for that and provided guidance on how to update to the latest firmware, keep his data, and stay on LUX CSC which he has now done.

    I think you may have misread the thread.
    1
    Oh right! Great. I shall do that. Although with Samkey, would I need to wipe data? If so, I'd rather not.

    Wouldn't bother myself, especially if network specific services like VOLTE rely on the CSC. For example, I know if I was to change from VOD to DBT, WiFi calling would stop working.

    I'm going to continue using Odin when updates with enough of an improvement are released. You've just done this, and you know it works.
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