tried the modded f16 bios? splash screen might work with that as its been updated
GA-Z77X-UD5H BIOS F16 mod11 (rev1.0 and 1.1)
Modified with :
Intel Legacy RAID for SATA 11.6.0.1702 to 13.1.0.2030
Intel UEFI RAID SataDriver 11.6.0.1702 to 13.1.0.2030
Marvell 88SE91xx Adapter 1.0.0.0027 to 1.0.1.0025
Atheros PCIE Ethernet Controller 2.0.2.7 to 2.0.6.6
Atheros PCIE Ethernet Controller 2.1.1.1 to 2.1.1.5
Intel Boot Agent GE 1.3.81 to 1.5.48
Intel GigabitLanX64 5.1.00 to 6.0.24
Intel PCI Accelerated SVGA BIOS 2158 to 2170
Intel Sandy GOPdriver 2.0.1023 to 2.0.1024
Intel Ivy GOPdriver 3.0.1023 to 3.0.1027
CPU MicroCode Pack (with Sandy 728 & Ivy 919)
ME Firmware 8.1.30.1350 to 8.1.51.1471
Modified splash logo 2
http://www.mediafire.com/download/3p1z6nehomftnif/z77xud5h_mod11_f16.zip