BIOS 0049 doesn't seems to fix any UEFI boot options (not listed in the BIOS readme), so change is small that this resolves something.
You could try to update the BIOS using the .BIO file and F7. My recommendation would be put the .BIO file on a location that you can access with just the default BIOS settings, so:
0) Remove non essential connections: usb mouse, network, etc
1) start system, F2, load bios default settings. Save.
2) restart system, F7 and flash .BIO file.
Updating the BIOS has a risk, I would do a search first on this forum to see if people have reported problems with 0049 and the DZ77GA-70K. Sometimes a newer revision brings more new issues then fixes.
The Windows 8 docs do state that UEFI is preferred for faster booting, but it seems that several BIOS revisions have issues when UEFI is enabled (based on the reports on this forum). You could also just disable UEFI, Windows 8 will normally be in sleep mode and reboot is actually rare.