this may be overkill, but:

i have a flashing program that, after flashing, mounts the root partition and copies the relevant files for enabling dev mode. i fully flash my n9, configure it, sync sms, install packages, without any internet whatsoever.

here is my rootstrap:

https://github.com/teleshoes/n9-conf...p-files.tar.gz

here are the tools i use for setting it up:
https://github.com/teleshoes/n9-conf...aster/flashing