Well, I'd do the following, on your desktop, in a temporary directory:

ar -x whateveritscalled.deb
tar -zxvf data.tar.gz

Then wander through the sub-directories to (probably ./usr/bin or perhaps ./usb/sbin) and copy the file in question to your n8x0. You might want to rename the existing file on your device rather than overwriting it, on the off chance that dpkg is bright enough to check that the file size is what it expected when it comes to upgrade it one day.