diff --git a/source/ble-services/MicroBitDFUService.cpp b/source/ble-services/MicroBitDFUService.cpp
index 729f671..702249f 100644
--- a/source/ble-services/MicroBitDFUService.cpp
+++ b/source/ble-services/MicroBitDFUService.cpp
@@ -234,7 +234,7 @@ void MicroBitDFUService::releaseFlashCode()
 {
     flashCode = NRF_FICR->DEVICEID[0];
 
-    ble.updateCharacteristicValue(microBitDFUServiceFlashCodeCharacteristicHandle, (uint8_t *)&flashCode, sizeof(uint32_t));
+    ble.gattServer().notify(microBitDFUServiceFlashCodeCharacteristicHandle,(uint8_t *)&flashCode, sizeof(uint32_t));
 }
 
 /**