diff --git a/CHANGELOG.md b/CHANGELOG.md
index db3ab502..087ab411 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,18 +13,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Updated kit purchasing links. 
 - MIN_ERG_CADENCE created and changed from 20 to 30.
 - Fixed DNS server in AP mode.
-- Fixed an issue with IC4 and variants not displaying device name in Bluetooth scanner. Fixes #500
+- Fixed an issue with IC4 and variants not displaying device name in Bluetooth scanner. Fixes #500.
 - Switched from using Power Table to a Torque Table for better compensation in cad variations. 
 - added test for invalid Peloton data to keep stepper from running away without resistance information.
 - Fixed a bug with Trainer Day and rapid ERG sending. 
 - Many updates and bug fixes which enable the Config App to communicate with SmartSpin2k. 
 - Scanned devices no longer saved to filesystem. The new scanning method would keep snowballing them otherwise. 
-- increased MTU for android
+- increased MTU for android.
 - Updated WiFi connection setup.
 - Firmware no longer updates if only the html files need to be loaded. 
+- BLE scans blocked during firmware upgrade.
 
 ### Hardware
-- added Yesoul S3
+- added Yesoul S3.
 - Wire diameter reduced from 7.2mm to 6.0mm on the window passthrough to accommodate the latest batch of cables. 
 - Changed reference to M4 bolt to M5 Bolt in the construction instructions pdf.
 - Increased right side case mounting hole to 5.5mm so the bolt slides in easier.
diff --git a/include/BLE_Common.h b/include/BLE_Common.h
index 3c5c2631..615289a8 100644
--- a/include/BLE_Common.h
+++ b/include/BLE_Common.h
@@ -59,7 +59,7 @@ class ss2kCustomCharacteristic {
  //Used internally for notify and onWrite Callback.
   static void process(std::string rxValue);
   //Custom Characteristic value that needs to be notified
-  static void notify(const uint8_t _item);
+  static void notify(char _item);
   // Notify any changed value in userConfig
   static void parseNemit();
 };
diff --git a/include/Main.h b/include/Main.h
index dc72e134..f8813d8f 100644
--- a/include/Main.h
+++ b/include/Main.h
@@ -35,9 +35,10 @@ class SS2K {
   bool externalControl;
   bool syncMode;
   int txCheck;
-  bool rebootFlag = false;
-  bool saveFlag   = false;
-  bool isUpdating = false;
+  bool rebootFlag        = false;
+  bool saveFlag          = false;
+  bool resetDefaultsFlag = false;
+  bool isUpdating        = false;
 
   bool IRAM_ATTR deBounce();
   static void IRAM_ATTR moveStepper(void *pvParameters);
diff --git a/src/BLE_Client.cpp b/src/BLE_Client.cpp
index 02915b2f..5f4d2950 100644
--- a/src/BLE_Client.cpp
+++ b/src/BLE_Client.cpp
@@ -86,7 +86,7 @@ void bleClientTask(void *pvParameters) {
       scanDelay = millis();
     }
 
-    if (spinBLEClient.doScan) {
+    if (spinBLEClient.doScan && (!ss2k->isUpdating)) {
       spinBLEClient.scanProcess();
     }
 
@@ -523,15 +523,6 @@ void SpinBLEClient::scanProcess(int duration) {
   pBLEScan = nullptr;  // free up memory
 }
 
-/*// This is the main server scan request process to use.
-void SpinBLEClient::serverScan(bool connectRequest) {
-  this->dontBlockScan = true;
-  if (connectRequest) {
-    this->scanRetries = MAX_SCAN_RETRIES;
-  }
-  this->doScan = true;
-}*/
-
 // remove the last connected BLE Power Meter
 void SpinBLEClient::removeDuplicates(NimBLEClient *pClient) {
   // BLEAddress thisAddress = pClient->getPeerAddress();
diff --git a/src/BLE_Server.cpp b/src/BLE_Server.cpp
index f2a5447b..8770a56e 100644
--- a/src/BLE_Server.cpp
+++ b/src/BLE_Server.cpp
@@ -323,6 +323,9 @@ void MyServerCallbacks::onConnect(BLEServer *pServer, ble_gap_conn_desc *desc) {
 void MyServerCallbacks::onDisconnect(BLEServer *pServer) {
   SS2K_LOG(BLE_SERVER_LOG_TAG, "Bluetooth Remote Client Disconnected. Remaining Clients: %d", pServer->getConnectedCount());
   BLEDevice::startAdvertising();
+  //client disconnected while trying to write fw - reboot to clear the faulty upload. 
+  if (ss2k->isUpdating) {SS2K_LOG(BLE_SERVER_LOG_TAG, "Rebooting because of update interruption.", pServer->getConnectedCount());
+  ss2k->rebootFlag = true;}
 }
 
 bool MyServerCallbacks::onConnParamsUpdateRequest(NimBLEClient *pClient, const ble_gap_upd_params *params) {
diff --git a/src/Custom_Characteristic.cpp b/src/Custom_Characteristic.cpp
index aeaf3073..d13466a1 100644
--- a/src/Custom_Characteristic.cpp
+++ b/src/Custom_Characteristic.cpp
@@ -45,7 +45,7 @@ void ss2kCustomCharacteristicCallbacks::onWrite(BLECharacteristic *pCharacterist
   ss2kCustomCharacteristic::process(rxValue);
 }
 
-void ss2kCustomCharacteristic::notify(const uint8_t _item) {
+void ss2kCustomCharacteristic::notify(char _item) {
   std::string returnValue = {cc_read, _item};
   process(returnValue);
 }
@@ -475,7 +475,7 @@ void ss2kCustomCharacteristic::process(std::string rxValue) {
     case BLE_resetToDefaults:  // 0x1D
       logBufLength += snprintf(logBuf + logBufLength, kLogBufCapacity - logBufLength, "<-reset to defaults");
       if (rxValue[0] == cc_write) {
-        userConfig->setDefaults();
+        ss2k->resetDefaultsFlag = true;
         returnValue[0] = cc_success;
       }
 
@@ -707,7 +707,7 @@ void ss2kCustomCharacteristic::parseNemit() {
     ss2kCustomCharacteristic::notify(BLE_maxBrakeWatts);
     return;
   }
-    if (userConfig->getShifterDir() != _oldParams.getShifterDir()) {
+  if (userConfig->getShifterDir() != _oldParams.getShifterDir()) {
     _oldParams.setShifterDir(userConfig->getShifterDir());
     ss2kCustomCharacteristic::notify(BLE_shiftDir);
     return;
diff --git a/src/HTTP_Server_Basic.cpp b/src/HTTP_Server_Basic.cpp
index 5d3a4983..a54140d6 100644
--- a/src/HTTP_Server_Basic.cpp
+++ b/src/HTTP_Server_Basic.cpp
@@ -176,16 +176,13 @@ void HTTP_Server::start() {
 
   server.on("/load_defaults.html", []() {
     SS2K_LOG(HTTP_SERVER_LOG_TAG, "Setting Defaults from Web Request");
-    LittleFS.format();
-    userConfig->setDefaults();
-    userConfig->saveToLittleFS();
+   ss2k->resetDefaultsFlag = true;
     String response =
         "<!DOCTYPE html><html><body><h1>Defaults have been "
         "loaded.</h1><p><br><br> Please reconnect to the device on WiFi "
         "network: " +
         myIP.toString() + "</p></body></html>";
     server.send(200, "text/html", response);
-    ESP.restart();
   });
 
   server.on("/reboot.html", []() {
diff --git a/src/Main.cpp b/src/Main.cpp
index 5d7b6fd8..fbba254b 100644
--- a/src/Main.cpp
+++ b/src/Main.cpp
@@ -216,6 +216,14 @@ void SS2K::maintenanceLoop(void *pvParameters) {
       _loopOnce = true;
     }
 
+    if (ss2k->resetDefaultsFlag) {
+      LittleFS.format();
+      userConfig->setDefaults();
+      userConfig->saveToLittleFS();
+      ss2k->resetDefaultsFlag = false;
+      ss2k->rebootFlag = true;
+    }
+
     // reboot every half hour if not in use.
     if ((millis() - rebootTimer) > 1800000) {
       if (NimBLEDevice::getServer()) {