Hi,

I am quite new to Nokia N9 and had difficulties in installing developer-mode, even with the N9RepoMirror tool installed.
Since I did not want to reflash the phone, I did "clean" it (bought it used) but some configuration file from, probably, older Harmattan version was left.

I had to modify and repack the N9RepoMirror .deb so that the postinst script also removed old repos from
aegis-ssu-keyring-232.list
file, other than the "standard" aegis-ssu-keyring-001.list
(had managed to install the terminal and noticed there was one more file in /etc/apt/sources.list.d).

After this, installed the "fixed" N9RepoMirror and was able to install developer-mode, WareHouse etc.

Just wanted to share my experience
Thank you for explaining what files are involved in repo checks!