show appropriate message when going into OTA mode

src/graphics/Screen.cpp

@@ -329,11 +329,7 @@ static void drawFrameFirmware(OLEDDisplay *display, OLEDDisplayUiState *state, i
     display->drawString(64 + x, y, "Updating");
 
     display->setFont(FONT_SMALL);
-    if ((millis() / 1000) % 2) {
-        display->drawString(64 + x, FONT_HEIGHT_SMALL + y + 2, "Please wait . . .");
-    } else {
-        display->drawString(64 + x, FONT_HEIGHT_SMALL + y + 2, "Please wait . .  ");
-    }
+    display->drawStringMaxWidth(0 + x, 2 + y + FONT_HEIGHT_SMALL, x + display->getWidth(), "Please be patient and do not power off.");
 }
 
 /// Draw the last text message we received

src/modules/AdminModule.cpp

@@ -112,12 +112,15 @@ bool AdminModule::handleReceivedProtobuf(const MeshPacket &mp, AdminMessage *r)
 #ifdef ARCH_ESP32        
         if (BleOta::getOtaAppVersion().isEmpty()) {
             DEBUG_MSG("No OTA firmware available, scheduling regular reboot in %d seconds\n", s);
+            screen->startRebootScreen();
         }else{
+            screen->startFirmwareUpdateScreen();
             BleOta::switchToOtaApp();
             DEBUG_MSG("Rebooting to OTA in %d seconds\n", s);
         }
 #else
         DEBUG_MSG("Not on ESP32, scheduling regular reboot in %d seconds\n", s);
+        screen->startRebootScreen();
 #endif
         rebootAtMsec = (s < 0) ? 0 : (millis() + s * 1000);
         break;