Changing firmware to a different CSC / different country? - Samsung Galaxy S8 Questions and Answers

Hello!
I have a US Galaxy S8 dreamqltesq. Current firmware is G950USQU6DSG7. I would like to put it on an XEF firmware. But this may be for a different CPU. Would it work?
Gilles

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[Q][I9505] CSC changed itself

hi guys. anyone experienced the same. here's what happened:
i was using i9505 glb kitkat (csc=glb=globe philippines). i flashed clockworkmod, then install carbon rom.
last month, i re-flash my original glb kitkat. then went to recovery. i noticed that the csc changed to sin (singapore singtel) without doing anything.
now my problem is what rom should i use next time i update to lollipop: glb or sin.
pls help and many thanks.
Is your phone SIM unlocked? If it is, it doesn't matter which CSC you use. Otherwise, stay with CSC GLB.
No. I used regionlockaway to make it sim unlocked.
Then as mentioned, the CSC doesn't matter. Case in point is my I9505. Originally an O2 phone, when I purchased it the S4 was already unlocked and had Ukranian firmware on it. When I installed the Black Edition UK firmware (CSC BTU) after repairing my S4's SIM tray and again removing the SIM lock, I ended up with CSC AUT (Switzerland) instead.
On an open firmware such as CSC BTU, there are actually multiple CSCs within the firmware, and all the CSC does is customize the firmware to the needs of a specific region. In the case of AUT, the firmware installed three Swiss-specific apps that could be easily removed. BTU and the other CSCs essentially do the same thing, and I am guessing this is without modifying the firmware itself.
Ok. Thanks guys. I'll still use glb firmware once lollipop is released. I had once semi-bricked my s4 (got repaired at samsung center) so i'm kinda nervous this time.

Can i Install a HongKong firmware to my G900F which previously had XSG Firmware???

I is possible to install a HongKong (TGY) firmware through Odin to my Galaxy S5 G900F which currently has UAE (XSG) Firmware
if fw was for a snapdragon cpu then yes
most if not all s5 snapdragon phones have same base software, the only diff is bloatware/carrier specific apps.
and maybe bootloader(ATT HAS IT LOCKED) and least likely modem but they can be flashed seperately or afterwards if need be

S8 (SM-G950W) CSC flashing and going back to original

I flashed my original Canadian S8 with an CSC from the U model in order to try out how it will behave
under my provider.
Now i want to go back to my original CSC so I flash my canadian firmware but the extra CSC customizations
from the US providers are still there.
I use the Samsung mobile info to see all available CSC codes and I do see the canadian providers plus the US providers.
Is there a way to erase all CSC and to have only the one that comes from the firmware?
It seems when I flash the canadian firmware with Odin, Odin does not erase the previous CSC but just appends

S5 Duos G900FD Baseband confusion: no update for my region/country + CP,AP,CSC differ

Dear XDA,
to get my fingerprint sensor working with Lineage-OS 7.1.2 on my S5 Duos, I want to update the baseband firmware.
Because I couldn't find any clear information of the region of my phone (*#1234# didn't work with lineage-os), and there is no firmware for my country/region, I thought I go the super-easy way to update via Kies3.
Done so, but unfortunately the baseband isn't updated, and there are no FOTA/Kies3 updates available. AP has been updated to the latest version (G900FDXXS1CQD2), but not the baseband ...
When I check AP,CP,CSC on now-stock rom with *#1234#, it says:
AP: G900FDXXS1CQD2
CP: G900FDXXU1CQA4 (as before Kies3-update)
CSC: g900FDOJV1CQB1
On sammobile.com and samsung-updates.com I find G900FDXXs1CQD2 firmwares, but nowhere they say whether it's AP, CSC or CP (the thing I need updated).
I think I don't mind the region as long as English and French is included and I can use LTE in (Western) Europe.
Two questions:
1)
a) when it says "Version" on (can't post urls) samsung-updates: is this the CP/Baseband?
b) similar on sammobile.com: There is PDA and CSC, both differing. But I need baseband/cp.
2) I understand that there are no carrier-specific firmwares (S5 duos apparently not sold by carriers?). So if version/pda is also baseband, which firmware do I download? There are 8 different firmwares with G900FDXXS1CQD2?
kind regards
1. Most likely it's AP, but CP should be the same as AP inside. Sorry, it looks like CQA4 is the latest CP for this S5 variant.
2. Most likely any if you're planning to flash modem only.
CPs will be the same.
Carrier firmwares within one S5 VARIANT and firmware VERSION differ by CSC and hidden partition size.

How to change CSC from XAA to TCE?

I bought a S8 + originally from Verizon. Then installed firmware unlocked (SM-G955U1) then the CSC automatically changed to XAA (usa unbranded).
I am currently using it in Mexico with Telcel. Everything works good, samsung pay does work, but I want to active VoLTE and use carrier ID anti spam there's no option to activate that because my CSC is not TCE, the problem is that the firmware is not SM-G955F (exynos version) that includes TCE (telcel México) CSC which allows to go to a specific setting menu to activate volte and ID anti spam.
I'm almost sure it is not possible changing the CSC because proccesor firmware incompatibility Snapdragon (SM-G955U1) and Exynos (SM-G955F).
The question is, can I change the CSC that comes with firmware U to a CSC that is supposed ONLY included in firmware F (exynos) ?
And how to do that?

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