R&D Mode:


1. Install Nokia Harmattan Flasher
2. Turn device off.
3. Run Flasher and copy and paste this command in:

flasher --enable-rd-mode --set-rd-flags=no-lifeguard-reset

4. It should say waiting for device, plug in your N9. A few seconds later it should say "In R&D Mode" or similar.
5. Now you can fix your device.
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6. Once you have fixed problem, turn device off again.
Open Flasher, copy, paste and Enter this command:

flasher --disable-rd-mode