I read from the bebook website that a 1GB SD card should be used for firmware update so I got myself one of these obsolete memory cards simply for this purpose (very hard to find one nowadays). But then I suddenly read from the Astak site that any card below 4GB can be used for firmware update. Well, which one should I trust? If 4GB cards can be used, I don't need to worry if I lose my 1GB card and can't find one anymore. Any idea?