after flashing bios to 1.80 version the issue is solved. It boots nicely without entering bios by itself and when I enter bios the cursor works fine.
anyone having the same issue that's ^^ the solution
its simply a uefi / usb mouse issue. i had it with my k60 on the msi bios, but corsair have stepped up and upgraded the software / firmware and works great now
plug a ps2 mouse in and i bet the issue disappears