Recovering from a boot loop (Samsung S9 Plus) ... which CSC?

I am currently stuck in a boot loop with my Samsung S9 Plus. The phone in question can be booted into recovery and download mode, but that’s about it.

I found that I should be able to use Frija or SamFirm to download the latest update, but it prompts me for the CSC. Now I understand what the CSC is supposed to be, but how do I find the appropriate one?

In my case the phone was bought in Germany, but initially it showed stuff in Italian when turning it on. So which CSC should I use? Or does it actually not matter at all?

Would it be okay to go with DBT (Germany, unbranded) as per this list?

I didn’t by the phone from the carrier, but on the free market.

NB: since the system is in a boot loop it’s too late to look up the proper CSC.