Enable flashing using USB-DFU protocol

For new boards like Tornado

_locales/en/messages.json

@@ -205,7 +205,7 @@
         "message": "Optional USB Permissions"
     },
     "default_optional_permissions_text": {
-        "message": "Due to addition of <strong>Naze32PRO</strong> to the supported hardware family, Configurator <strong style=\"color: red\">requires</strong> USB access to allow firmware flashing via DFU"
+        "message": "To allow flashing some newer flight controllers, Configurator <strong style=\"color: red\">requires</strong> USB access"
     },
     "default_request_optional_permissions": {
         "message": "Request Optional Permissions"

js/protocols/stm32usbdfu.js

@@ -296,9 +296,6 @@ STM32DFU_protocol.prototype.upload_procedure = function (step) {
             var bytes_flashed_total = 0; // used for progress bar
             var wBlockNum = 2; // required by DFU
 
-            // start
-            self.loadAddress(address, write);
-
             var write = function () {
                 if (bytes_flashed < self.hex.data[flashing_block].bytes) {
                     var bytes_to_write = ((bytes_flashed + 2048) <= self.hex.data[flashing_block].bytes) ? 2048 : (self.hex.data[flashing_block].bytes - bytes_flashed);
@@ -353,6 +350,10 @@ STM32DFU_protocol.prototype.upload_procedure = function (step) {
                     }
                 }
             }
+
+            // start
+            self.loadAddress(address, write);
+
             break;
         case 5:
             // verify

tabs/landing.js

@@ -10,7 +10,7 @@ TABS.landing.initialize = function (callback) {
     }
 
     $('#content').load("./tabs/landing.html", function () {
-        //check_usb_permissions(); // temporary enabled in dev branch, should be commented out untill DFU support goes live
+        check_usb_permissions(); // check for permissions require for USB DFU support
 
         // translate to user-selected language
         localize();