Avalon usb interface should be 0.
diff --git a/usbutils.c b/usbutils.c
index cd9ffff..3407eb7 100644
--- a/usbutils.c
+++ b/usbutils.c
@@ -154,7 +154,7 @@ static struct usb_find_devices find_dev[] = {
.idProduct = 0x6001,
.kernel = 0,
.config = 1,
- .interface = 1,
+ .interface = 0,
.timeout = AVALON_TIMEOUT_MS,
.epcount = ARRAY_SIZE(ava_eps),
.eps = ava_eps },