Read-only file system /config

I can’t write to files in de /config-folder anymore.
Whenever I try, I get something like:

[Errno 30] Read-only file-system: ‘config/automations.yaml’ undefined.

I tried a solution suggested in a related post where I have to use this command for a start:
curl -X POST

Unfortunately, the response is:
curl: (7) Failed to connect to port 80: Operation timed out

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@stefan2140: Have you ever found a solution? I know this is an old thread, but I am running into similar problems.