So guys, I successfully changed my CSC (a few times), and turns out there is no beta banner - for UK and DBT. I will share the software but keep in mind that I found it on the internet and I do not guarantee it. However, it worked for me. I also checked in the virus total and seems fine.
Wonder why only the snapdragon version got the beta program. Probably because it's an old device and Samsung doesn't care much for it and its users.
Link: SamFw Tool v3.31
And this is where I get it. All credits to the author - SamFw