upgrade firmware
 

Please help me, How to upgrade the firmware in Linux EL-4.
ie, (BIOS, MM/RAC version. RAID)

Thanks in advance !

The linux distribution...

If you mean EL-4, the RedHat distribution, the answer depends on the hardware you are running it on. Look at the documentation for your motherboard and search the Internet to see if you can get more information in case there are no direct methods to update using linux and the hardware in your system.

EL-4 is old. Have you considered the latest RHEL, CentOS or Scientific Linux?

You need to be more specific in what exactly you are doing. What actual device are you trying to upgrade on your computer/system?