[Q] Is "fastboot oem writesecureflag 3" irreversible? topic

I have a phone that was S-off, but was set back to S-on with fastboot oem writesecureflag 3.

Now I want to change it back to S-off, but can't get it to work. Tried rumrunner and firewater. Both fail. Can this phone be set for S-off anymore, or does fastboot oem writesecureflag 3 permanentlt set S-on?

My HBOOT is 1.56