See http://www.mobileread.com/forums/sho...95#post1878595 for the references.
Is it possible to reflash using an SD card or through the usb cable?
Is a factory reset possible without flashing anything?
If not, is it still possible to get the files somewhere?

Is it possible to do a factory reset without flashing? Yes, possible, under certain conditions. You must have shell access and a backup of factory setting registry. Overwrite the "registry.xml" file on your iLiad and you have a factory reset. For most people, it is hard to meet the required conditions.

Reflash file can be obtained by search for "cf-card-contents.zip" using Google. Have patience browsing.

Be warned. You'll lose shell access privilege (if you had it) and mobipocket reader after reflashing.