I have created big sur usb three times thinking i was not following your directions correctly, When i boot in to the usb i always get this This version of Mac os x is not supported on this platform Reason: Mac-27ADBB7B4CEE8E61 Sleeping for 30 seconds before existing. I have GA-B85-HD3 board i5-4590s 3.0 16gb ram. PLEASE HELP i have been trying for days