@Paolo_Tognola While I’m very thankful to you for having confirmed that the issue was, indeed, a problem typing the commands I posted and not an issue in the app itself, I wanted to make it very clear that this was not your fault either:
Those commands are easy to mistype and when doing they are quite destructive (as you could see), and so I should have been the one making it very clear that they would have to be carefully typed and executed or, even better, to provide a different way (e.g. a script) for you to do it so safely.
So please, don’t say that it was your fault or that you did wrong, because it’s a perfectly understandable mistake, and sorry again for me not being clear enough.
Thanks again for your help,
Mario