So it’s finally working. It worked with 1 USB drive for 1.8 but then not for 1.9. I ordered a new Blaze 8GB Sandisk Blaze and that worked to get me up to 1.9. Not sure why 1 usb would work for 1.8 and then not work for 1.9 immediately after. Allen&Heath really should allow any USB drive to update firmware, but that’s just my opinion. Thanks everyone for the feedback & options.