diff --git a/include/palerain.h b/include/palerain.h
index fb69005..26686ff 100644
--- a/include/palerain.h
+++ b/include/palerain.h
@@ -31,6 +31,7 @@
 #define USB_RET_SUCCESS         LIBUSB_SUCCESS
 #define USB_RET_NOT_RESPONDING  LIBUSB_ERROR_OTHER
 #define USB_RET_IO              LIBUSB_ERROR_IO
+#define USB_RET_NO_DEVICE		LIBUSB_ERROR_NO_DEVICE
 typedef int usb_ret_t;
 typedef libusb_device_handle *usb_device_handle_t;
 
@@ -51,7 +52,8 @@ usb_ret_t USBBulkUpload(usb_device_handle_t handle, void *data, int len);
 
 #define USB_RET_SUCCESS         KERN_SUCCESS
 #define USB_RET_NOT_RESPONDING  kIOReturnNotResponding
-#define USB_RET_IO				kIOReturnNotResponding
+#define USB_RET_IO              kIOReturnNotReady
+#define USB_RET_NO_DEVICE       kIOReturnNoDevice
 
 typedef IOReturn usb_ret_t;
 typedef IOUSBInterfaceInterface245 **usb_device_handle_t;
diff --git a/src/pongo_helper.c b/src/pongo_helper.c
index c48a7c9..161f2ce 100644
--- a/src/pongo_helper.c
+++ b/src/pongo_helper.c
@@ -129,10 +129,10 @@ fetch_output:
 bad:
 	if (ret != USB_RET_SUCCESS)
 	{
-		if (ret == USB_RET_NOT_RESPONDING)
-			return 0;
-        if (command != NULL && (!strncmp("boot", command, 4) && ret == USB_RET_IO))
-            return 0;
+        if (command != NULL && (!strncmp("boot", command, 4))) {
+			if (ret == USB_RET_IO || ret == USB_RET_NO_DEVICE || ret == USB_RET_NOT_RESPONDING)
+				return 0;
+		}
 		LOG(LOG_ERROR, "USB error: %s", usb_strerror(ret));
 		return ret;
 	}