Installed Firmware

You can check the current BIOS and ECP versions
on your ThinkPad by using dmidecode.

For example:
# dmidecode -s bios-version

1RETDRWW (3.23 )

# dmidecode -t 11

# dmidecode 2.9
SMBIOS 2.33 present.
Handle 0x0029, DMI type 11, 5 bytes
OEM Strings

String 1: IBM ThinkPad Embedded Controller -[1RHT71WW-3.04]-

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