we3735

i had nex4000 installed at bestbuy and have same problem of firmware button greyed out. I went to AV and turned it to off. I cycled the parking break but no change. I have a 2001 Mitsubishi eclipse spyder. Any suggestions. Should I go back to best buy? Any suggestions. I bought this for carplay. the fw version on the unit was 1.03. I am trying to load 1.08 connect usb1. it shows that the flash drive is in usb1.