My N900 without the operating system OS

Hello! To all, I want to help, my N900 no longer shows the option of Maemo, and no other in MultiBoot, I will cite all the steps I went through before my problem occurs.

It worked very well with the "Maemo" most wanted install "ANDROID" then follow the steps that are here at this link, http://wiki.maemo.org/Nitdroid_easy_install_on_EMMC
and everything went fine, installing the CMMS NITDROID 0.0.9 FOR ANDROID worked much more with some limitations, so I made the steps to install the gingerbread INSTALLING THE EMMC, over the old one nothing happened, I did step by step to uninstall Android with the following commands step by step UNINSTALLING NITDROID and uninstalled right, the phone worked fine until MultiBoot was uninstalled, then tried installing the gingerbread iNSTALLING THE EMMC command all worked again, when I hung up and called the N900 he entered the multiboot with only the option of Maemo,
without the option of ANDROID, then repeat the command dpkg-i / home / user / MyDocs / NITDroid-kernel-Mido.Fayad.deb this time has failed, after rebooting the N900 appears MultiBoot no options. these commands typed by Xterminal.
What do I do?
ADRIANOXYZ