I'm having a similar issue with the DZ77RE-75K motherboard, except that BIOS v49 works normally.
If I update the BIOS to v53 or v59 the motherboard will not recognize USB input until Windows boots. This means I can not access the BIOS except by using a PS2 keyboard. I also have an Acronis recovery prompt that is inaccesible.
I have tried updating BIOS using the .exe file and the F7 prompt at POST
Has anyone figured out a fix for this?
I would recommend to try different USB ports. For me 2 out of 12 installed ports worked to get into bios Screen.
I am using a logitech dinovo edge Keyboard on the yellow marked usb port on the mobo backconnector. First it was not recognized. i thougt the Bluetooth connector may be the cause of not detecting the Keyboard. Then i put a usb Keyboard to the front usb connectors not getting in the bios Screen. When i connected the Keyboard to the usb back connector (second yellow port), the keyboard was recognized. When the cabled Keyboard was working my BT keyboard worked too. When disconnecting the cabled Keyboard the dinovo isn´t recognized anymore.
I did some bios updates in the last days, because of new Versions not recognizing my RAID Controller and i found different usb ports working with my keyboard relating to the bios Version. Never all ports worked to get in the Bios Screen