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Posts: 1,067 | Thanked: 2,383 times | Joined on Jan 2012 @ Finland
#5
sudo flasher -f -F firmware.bin -F emmc.bin --erase-user-data=secure -R

(replace firmware and emmc with your region variants)
that will take 15-30 mins depending of your usb ports speed, and will reset N9 to factory defaults, ie after that you should be able to set developer mode (as a downside you need to reinstall every application after that one).

And remember to set the clock to current date before trying to enable developer mode, otherwise enable might fail.
 

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