OpenZaurus gives you a writable file system as opposed to a ROM file system which Sharp gives you.
Upgrading from 1.0.3 to 1.1.3 is best done by erasing all Opie packages, then installing the new ones. Unfortunately older ipkg versions suck, so you must install a new ipkg before doing anything substantial.
I don\'t recommend modifiyng an OZ initrd - this is not Sharp ROM, we can build from source Time would better be spent helping us to get OZ 3.5.1 out.