The firmware version can be easily checked out in Linux by dmidecode, a tool to locate the computer’s Desktop Management Interface (DMI) table and dump the content to human-readable content. The dmidecode can find out more information, but we only used to find out the firmware version here.
One command simply:
# dmidecode -s bios-version
The BIOS version will be printed out. That’s it!
# yum install dmidecode
One example of the output is as follows.
# dmidecode -s bios-version A05