Welcome to the forum!
The manual will tell you which usb port to use for the ROG connect and how to flash the bios with ROG connect also.
Now for your problem at hand, My suggestion is to clear the cmos. Start with removing the power cord from the back of the computer then press the clear the cmos button just below the PS2/usb ports in the rear IO area, if that brings no joy then leave the power cord disconnected, use the manual to identify the clear cmos jumper and set it to the clear position and remove the battery and wait for at least 1/2 hour before replacing the battery and returning the jumper back to it's default position and reconnect the power cord.
Electronic Smoke Signals From my TechnoTeepee
ASUS Crosshair V Formula AM3+ 990FX, 1703 bios
AMD FX 8350 Vishera @ 5162Mhz [21x245] 1.546v 🙂
Water Cooled - Koolance EX2-1055, CPU 370 WB, Idle=22c Load=52c
32Gb G.Skill Sniper ddr3 1600 8G X 4 , 9-9-9-24 @ 1.55v
ASUS HD7970-DC2T-3GD5, Cat 13.5 beta 2, Dell U3011 @ 2560x1600
SanDisk Extreme 120Gb SSD SATA 6Gb, 250Gb SATA 6Gb, 1Tb SATA 6Gb x2
Win 7 Ultimate 64bit, Corsair Obsidian 800D, Corsair HX1000w PSU