I've got to ask this question.
My N9 is locked to operator let's call it "A". As far as I know it's not branded, but to be honest, I don't have access to miscrosim from operator "A" to check it (no signs of operator "A" when powered without any SIM).
I bought unlock code, but I'm unable to enter it (http://talk.maemo.org/showthread.php?t=83172).
I want to use it with SIM from operator "B". I've checked, phone powers off immediately with SIM "B" inserted.
Will any type of flashing ("comprehensive reset" or "zeroize device") remove lock to operator "A". I'm asking this because image bin files are accompanied by strange files called "simlock*.bin".

And also this guide is amazing. All crucial info about flashing in one elegant place