Delete login data failed

Hi at all,

I would like to log into the home assistant of a recently deceased friend to make changes. Unfortunately, my friend did not store the login information. I wanted to delete his login information in the .storage folder to create a new user. This worked fine in my test installation. However, the data on my friend’s SD card is not deleted.

I used to delete a tool under Windows

Is there a write protection that I can disable?
Can I alternatively read the user?

The system is a HA via RPi4

Thank you very much for your help