This is a known bug in the installation program. It was supposed to say that the BIOS installed successfully. If you reboot and do not see the message appear again, you can just forget that it ever appeared...
This message was posted on behalf of Intel Corporation
As you can see on the response provided by N. Scott Pearson, this is a known bug in the installation program, and most of the times after the reboot should disappear.
Thank you very much for your feedback, N. Scott Pearson
I hope the information above was useful for you.
Any questions, please let me know.