LP-512 Fixed bootloader and dfu to be able to go into proper rescue mode without having *any* firmware flashed.

flight/libraries/op_dfu.c

@@ -157,7 +157,8 @@ void processComand(uint8_t *xReceive_Buffer)
     switch (Command) {
     case EnterDFU:
         if (((DeviceState == BLidle) && (Data0 < numberOfDevices))
-            || (DeviceState == DFUidle)) {
+            || (DeviceState == DFUidle)
+            || (DeviceState == failed_jump)) {
             if (Data0 > 0) {
                 OPDfuIni(true);
             }

flight/targets/boards/spracingf3evo/bootloader/main.c

@@ -199,6 +199,7 @@ void jump_to_app()
         Jump_To_Application();
     } else {
         DeviceState = failed_jump;
+        JumpToApp = FALSE;
         return;
     }
 }