I made the mistake of shutting down my tablet after it had been on a black screen for more than three hours. Now it's permanently stuck on the bootlogo. I've tried accessing recovery mode, but telnet says "telnet: telnet: bad port". Today is not a good day.

Ironically, if I had simply used 'version --dup' or olf's update script from OpenRepos, none of these problems would have happaned and this post would be talking about the changes in 4.0.