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Cannot boot Cd-rom or other removable devices (USB) after bios upgrade

You may find yourself in a situation when after a bios upgrade (rewriting of the bios firmware) your system won't recognize your cd-rom or other removable devices like Usb sticks.
Some bioses retain the configuration after upgrading them some won't and will require you to reconfigure the bios.
I strongly suggest that after any bios upgrade you clear the CMOS. This means that you will clear all the values which remained saved from the previous bios. After clearing the CMOS you will have to reconfigure your BIOS. Usually it should work fine with default values so for the usual user BIOS reconfiguration is not a must.

Clear the CMOS after bios upgrade and your new bios should now recognize your cd-rom and other removable media like usb.