На сайте производителя нет ссылки на bios данной модели.

нагуглил за пару минут
http://www.dexplor.com/phpBB2/viewtopic.php?f=2&t=149

The eMachines M5309 uses the Arima W720-K7 motherboard the same as the M5310. The Medion BIOS update is now up to version ME09. This version keeps the processor speed the same as the eMachines BIOS and has the capability to increase video RAM to 128 MB - I didn't check the RAM read rate or do any benchmarking.

Go to this page:
http://www1.medion.de/downloads/?lang=fr
and enter the model number 40072 in the middle box (Modèle de votre ordinateur portable ou de votre périphérique) and click Rechercher - you are taken to a page where you can download the ME09 BIOS under the Reprogrammation du Bios RAM 2000 heading.

Click on Telecharger (download) to download the file. Double click on bioram2000.exe to extract the files to the C:\Medion directory. Copy the files in C:\Medion to your DOS boot floppy or your bootable CD - see below.

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