A tedious way of doing this, if you have internet access on another device (eg the one you are using to view this forum now), is to use the Power Search on the right and search for rootsh, uboot and backupmenu, select packages, and navigate to the relevant package instance page to manually download the package eg for rootsh:
http://maemo.org/packages/package_in...el/rootsh/1.8/

You must also check to see what the dependancies are and download those packages too if they aren't already installed on a fresh install (eg i2c-tools for backupmenu).

I think you could then install rootsh by clicking on it from file manager, and then install the other files by dpkg -i.