I've just purchased a used Variax Acoustic 700 and it had some firmware issues so i tried to update it with the latest version (3.25)! Well that reallyscrewed the guitar right up as halfway through updating it came up with an error message saying midi connection had been lost. So I went onto the Line 6 website (downloads page) and found the original factory firmware version 2.02 by selecting an old version of Windows in the drop down menu.. Downloaded that to my windows 10 laptop, connected Variax 700 through POD HD500X with variax midi cable, ran Line 6 monkey, installed firmware version 2.02 FROM FILE by following instructions and Bobs yer Uncle! Sorted!
VariaxAcoustic_2.02.vxf