Found an open dir with some firmware and software of multiple Irex models:
http://files.leer-e.es/descargas/
The file cf-card-contents.zip supposedly contains the Iliad firmware, but I don't know which version it is.
I have found another product with a compatible connector, but this connector doesn't have all of the pins. It contains 8 pins out of the 20. It is possible to rearrange the pins with some pliers to make a charger/usb connection or combined using the info from
this thread.
Product page.