To check your BIOS version, issue the following at the prompt:

[root@mbpc ~]# dmidecode

# dmidecode 2.11
SMBIOS 2.4 present.
59 structures occupying 2935 bytes.
Table at 0x000F0100.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
        Vendor: Award Software International, Inc.
        Version: FC
        Release Date: 08/02/2010
        Address: 0xE0000
        Runtime Size: 128 kB
        ROM Size: 1024 kB
        Characteristics:
                ISA is supported
                PCI is supported
                PNP is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                Boot from CD is supported
                Selectable boot is supported
                BIOS ROM is socketed
                EDD is supported
                5.25"/360 kB floppy services are supported (int 13h)
                5.25"/1.2 MB floppy services are supported (int 13h)
                3.5"/720 kB floppy services are supported (int 13h)
                3.5"/2.88 MB floppy services are supported (int 13h)
                Print screen service is supported (int 5h)
                8042 keyboard services are supported (int 9h)
                Serial services are supported (int 14h)
                Printer services are supported (int 17h)
                CGA/mono video services are supported (int 10h)
                ACPI is supported
                USB legacy is supported
                LS-120 boot is supported
                ATAPI Zip drive boot is supported
                BIOS boot specification is supported
                Targeted content distribution is supported

Handle 0x0001, DMI type 1, 27 bytes
System Information
        Manufacturer: Gigabyte Technology Co., Ltd.
        Product Name: GA-890XA-UD3
        Version:
        Serial Number:
        UUID: 31433646-3635-3346-4643-3134FFFFFFFF
        Wake-up Type: Power Switch
        SKU Number:
        Family:

Handle 0x0002, DMI type 2, 8 bytes
Base Board Information
        Manufacturer: Gigabyte Technology Co., Ltd.
        Product Name: GA-890XA-UD3
        Version: x.x
        Serial Number:

Sometimes the board won't show a version however as in the above but the date can be a good indicator as well as these are typically dated.

Cheers,
TK