OK, I reached a point where I need my N9 flashed.
I tried and read what I was able to find in TMO, but all was either old, or not understandable by a (almost) common user like me.
can I just reset the phone through its settings and then try to install repomirror?

ΟΚ, Stupid me!
Done it with flashing.
Now for the rest...


Success!