Is there any other resource I could try to find this OEM 1.1 bios driver?
I don't really know.
Does you board have firewire?
I just had a look at the German Medion Site. One of the criteria they use to sort the board revision is firewire/no firewire. That is why I am asking.
I just had a look around. There seem to be quite a lot different OEM versions of this board around and as many corresponding BIOS Files. Flashing the wrong BIOS could ruin the system altogether. If you don't have any major problems with your current BIOS, there is no point in flashing a different version anyway.
If you are really sure you have to flash. Contact Medion Support directly and request information on compatible BIOS files that are safe to flash.
I am afraid we cannot not really help you here.