In this thread you can post your requests for Lenovo G500 and G400 bios unlock. If someone wants upgrade Wi-Fi card and remove whitelist, or unlock hidden additional menus and settings in bios setup menu, then you can post your request in this thread.   For prepare unlocked bios you should post your request here and then send me your file backup of bios via PM or upload it into any fileserver and send me the link.  For creating backup of bios use attached utility. Extract attached