Have you read the release notes to the latest bios?
In the first chapter they describe how to check the MEI firmware version. So first update with MEI Update to the 0048 and later on to the 0120.
i tried to update to 048 but everytime i do so the boot screen shows up ( the pic above) and its not allowing my current bios ver 20 to update to 048
i tried all versions 048 099 120
its says please update bios using Iflash or update utility