I formatted a USB 2.0 pen drive to FAT32 put the CAP file directly on it with nothing else on the drive and renamed it X99A2.CAP. I put the usb pendrive in the USB port directly below the Flashback.button. I held the button a few seconds until the LED started blinking but after blinking about five times it goes solid. So unable to install the Bios.
My pc
Asus X99-A II motherboard, EVGA GeForce GTX 1080 SC graphics card, Intel i7-6800K cpu,Corsair Vengeance LPX 32gb 2x16gb DDR4 3200mhz, PNY 240gb SSD, Seagate 6tb hard drive, Corsair RM Series RM850X '80+ Gold' 850W Modular Power Supply,