diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5af971f0..f803cecc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.10)
-project(pinetime VERSION 0.4.0 LANGUAGES C CXX ASM)
+project(pinetime VERSION 0.5.0 LANGUAGES C CXX ASM)
 
 set(NRF_TARGET "nrf52")
 
diff --git a/README.md b/README.md
index 790e3de1..4c970f8e 100644
--- a/README.md
+++ b/README.md
@@ -27,14 +27,16 @@ I've tested this project on the actual PineTime hardware.
  * Project builds and runs on the Pinetime;
  * Logs available via JLink RTT;
  * SPI (DMA & IRQ based) LCD driver;
- * BLE advertising, connection and bonding;
+ * Open source BLE stack :  [NimBLE](https://github.com/apache/mynewt-nimble);
+ * BLE advertising and connection connection;
  * BLE CTS client (retrieves the time from the connected device if it implements a CTS server);
  * Push button to go to disable screen (and go to low power mode) / enable screen (and wake-up) and UI navigation
  * Touch panel support;
  * Rich user interface (using [LittleVGL](https://littlevgl.com/)) via display, touchpanel and push button.
  * Digital watch face and 4 demo applications (spinning meter, analog gauche, push button and message box);
  * Watchdog (automatic reset in case of firmware crash) and reset support (push and hold the button for 7 - 10s);
- * BLE Notification support (still Work-In-Progress, [companion app](https://github.com/JF002/gobbledegook) needed). 
+ * BLE Notification support (still Work-In-Progress, [companion app](https://github.com/JF002/gobbledegook) needed);
+ * Supported by companion app [Amazfish](https://openrepos.net/content/piggz/amazfish) (time synchronization and notifications are integrated).
 
 ## Documentation
 
@@ -77,10 +79,6 @@ See [this page](./doc/PinetimeStubWithNrf52DK.md)
             - -DOPENOCD_BIN_PATH=[path to openocd]
 
 
-  * Optionally, you can define MERGEHEX with the path to the ```mergehex``` tool from [NRF5X Command Line Tools](https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrf5x_cltools%2FUG%2Fcltools%2Fnrf5x_command_line_tools_lpage.html&cp=6_1) to be able to merge the application and softdevice into one HEX file. In this case the merged file is generated in src/pinetime-app-full.hex
-    
-        - -DMERGEHEX=[Path to the mergehex executable]
-
 JLINK
 ```
 $ mkdir build
@@ -116,18 +114,6 @@ $ make -j pinetime-app
 $ make FLASH_ERASE
 ```   
 
-* Flash softdevice & application
-
-```
-$ make FLASH_SOFTDEVICE
-$ make FLASH_pinetime-app
-```
-
-Or, with ```mergehex```
-
-```
-$ make FLASH_MERGED_pinetime-app
-```
 
 * For your information : list make targets :
 
@@ -208,7 +194,7 @@ $ JLinkRTTClient
 
  - https://github.com/eliotstock/memory : display the memory usage (FLASH/RAM) using the .map file from GCC.
  
-## BLE connection, bonding and time synchronization
+## BLE connection and time synchronization
 At runtime, BLE advertising is started. You can then use a smartphone or computer to connect and bond to your Pinetime. 
 As soon as a device is bonded, Pinetime will look for a **CTS** server (**C**urrent **T**ime **S**ervice) on the connected device.
 
@@ -223,7 +209,7 @@ Here is how to do it with an Android smartphone running NRFConnect:
     - Select server configuration "Current Time Service" and tap OK
 * Go back to the main screen and scan for BLE devices. A device called "PineTime" should appear
 * Tap the button "Connect" next to the PineTime device. It should connect to the PineTime and switch to a new tab.
-* On this tab, on the top right, there is a 3 dots button. Tap on it and select Bond. The bonding process begins, and if it is sucessful, the PineTime should update its time and display it on the screen.
+* If a CTS server is found, the Pinetime should update its time with the time provided by the server.
 
 ### Using Linux and bluetoothctl
 * Ensure that your bluetooth controller is enabled and working fine. I've tested this on a x86 Debian computer and on a RaspberryPi 3.
diff --git a/cmake-nRF5x/CMake_nRF5x.cmake b/cmake-nRF5x/CMake_nRF5x.cmake
index ec4b47db..c1785d36 100755
--- a/cmake-nRF5x/CMake_nRF5x.cmake
+++ b/cmake-nRF5x/CMake_nRF5x.cmake
@@ -5,10 +5,6 @@ if (NOT NRF5_SDK_PATH)
     message(FATAL_ERROR "The path to the nRF5 SDK (NRF5_SDK_PATH) must be set.")
 endif ()
 
-#if (NOT NRFJPROG)
-#    message(FATAL_ERROR "The path to the nrfjprog utility (NRFJPROG) must be set.")
-#endif ()
-
 # convert toolchain path to bin path
 if(DEFINED ARM_NONE_EABI_TOOLCHAIN_PATH)
     set(ARM_NONE_EABI_TOOLCHAIN_BIN_PATH ${ARM_NONE_EABI_TOOLCHAIN_PATH}/bin)
@@ -70,23 +66,15 @@ macro(nRF5x_setup)
         endif()
         set(CPU_FLAGS "-mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16")
         add_definitions(-DNRF52 -DNRF52832 -DNRF52832_XXAA -DNRF52_PAN_74 -DNRF52_PAN_64 -DNRF52_PAN_12 -DNRF52_PAN_58 -DNRF52_PAN_54 -DNRF52_PAN_31 -DNRF52_PAN_51 -DNRF52_PAN_36 -DNRF52_PAN_15 -DNRF52_PAN_20 -DNRF52_PAN_55 -DBOARD_PCA10040)
-#        add_definitions(-DSOFTDEVICE_PRESENT -DS132 -DSWI_DISABLE0 -DBLE_STACK_SUPPORT_REQD -DNRF_SD_BLE_API_VERSION=6)
         add_definitions(-DFREERTOS)
         add_definitions(-DDEBUG_NRF_USER)
-#        add_definitions(-D__STARTUP_CLEAR_BSS)
-#        add_definitions(-D__HEAP_SIZE=8192)
-#        add_definitions(-D__STACK_SIZE=2048)
-
         include_directories(
-#                "${NRF5_SDK_PATH}/components/softdevice/s132/headers"
-#                "${NRF5_SDK_PATH}/components/softdevice/s132/headers/nrf52"
           "${NRF5_SDK_PATH}/components/drivers_nrf/nrf_soc_nosd"
         )
         list(APPEND SDK_SOURCE_FILES
                 "${NRF5_SDK_PATH}/modules/nrfx/mdk/system_nrf52.c"
                 "${NRF5_SDK_PATH}/modules/nrfx/mdk/gcc_startup_nrf52.S"
                 )
-#        set(SOFTDEVICE_PATH "${NRF5_SDK_PATH}/components/softdevice/s132/hex/s132_nrf52_6.1.1_softdevice.hex")
     endif ()
 
     set(COMMON_FLAGS "-MP -MD -mthumb -mabi=aapcs -Wall -g3 -ffunction-sections -fdata-sections -fno-strict-aliasing -fno-builtin --short-enums ${CPU_FLAGS} -Wreturn-type -Werror=return-type")
@@ -243,7 +231,6 @@ macro(nRF5x_setup)
     # Other external
     include_directories(
             "${NRF5_SDK_PATH}/external/fprintf/"
-#            "${NRF5_SDK_PATH}/external/utf_converter/"
     )
 
     list(APPEND SDK_SOURCE_FILES
@@ -255,103 +242,25 @@ macro(nRF5x_setup)
     # LCD/GFX
     include_directories(
       "${NRF5_SDK_PATH}/external/thedotfactory_fonts"
-#      "${NRF5_SDK_PATH}/components/ble/ble_db_discovery"
     )
 
-    list(APPEND SDK_SOURCE_FILES
-#      "${NRF5_SDK_PATH}/components/ble/ble_db_discovery/ble_db_discovery.c"
-#      "${NRF5_SDK_PATH}/components/ble/ble_services/ble_cts_c/ble_cts_c.c"
-#      "${NRF5_SDK_PATH}/components/ble/ble_services/ble_ans_c/ble_ans_c.c"
-#      "${NRF5_SDK_PATH}/external/thedotfactory_fonts/orkney24pts.c"
-      )
-
-    #BLE S132
-#    include_directories(
-#      "${NRF5_SDK_PATH}/components/ble/common"
-#      "${NRF5_SDK_PATH}/components/ble/ble_advertising"
-#      "${NRF5_SDK_PATH}/components/ble/ble_services/ble_bas"
-#      "${NRF5_SDK_PATH}/components/ble/ble_services/ble_hrs"
-#      "${NRF5_SDK_PATH}/components/ble/ble_services/ble_dis"
-#      "${NRF5_SDK_PATH}/components/ble/nrf_ble_gatt"
-#      "${NRF5_SDK_PATH}/components/libraries/sensorsim"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager"
-#      "${NRF5_SDK_PATH}/components/ble/nrf_ble_qwr"
-#    )
-
-    LIST(APPEND SDK_SOURCE_FILES
-#      "${NRF5_SDK_PATH}//components/ble/common/ble_srv_common.c"
-#      "${NRF5_SDK_PATH}/components/ble/ble_advertising/ble_advertising.c"
-#      "${NRF5_SDK_PATH}/components/ble/common/ble_advdata.c"
-#      "${NRF5_SDK_PATH}/components/ble/ble_services/ble_bas/ble_bas.c"
-#      "${NRF5_SDK_PATH}/components/ble/ble_services/ble_hrs/ble_hrs.c"
-#      "${NRF5_SDK_PATH}/components/ble/ble_services/ble_dis/ble_dis.c"
-#      "${NRF5_SDK_PATH}/components/ble/nrf_ble_gatt/nrf_ble_gatt.c"
-#      "${NRF5_SDK_PATH}/components/libraries/sensorsim/sensorsim.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/peer_manager.c"
-#      "${NRF5_SDK_PATH}/components/ble/nrf_ble_qwr/nrf_ble_qwr.c"
-#      "${NRF5_SDK_PATH}/components/ble/common/ble_conn_state.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/auth_status_tracker.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/gatt_cache_manager.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/gatts_cache_manager.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/id_manager.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/peer_data_storage.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/peer_database.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/peer_id.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/peer_manager.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/peer_manager_handler.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/pm_buffer.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/security_dispatcher.c"
-#      "${NRF5_SDK_PATH}/components/ble/peer_manager/security_manager.c"
-#      "${NRF5_SDK_PATH}/components/ble/common/ble_conn_state.c"
-#      "${NRF5_SDK_PATH}/components/ble/common/ble_conn_params.c"
-#      "${NRF5_SDK_PATH}/components/ble/common/ble_conn_state.c"
-#      "${NRF5_SDK_PATH}/components/libraries/atomic_flags/nrf_atflags.c"
-#      "${NRF5_SDK_PATH}/components/libraries/fds/fds.c"
-#      "${NRF5_SDK_PATH}/components/libraries/fstorage/nrf_fstorage.c"
-#      "${NRF5_SDK_PATH}/components/libraries/fstorage/nrf_fstorage_sd.c"
-#      "${NRF5_SDK_PATH}/components/libraries/atomic_fifo/nrf_atfifo.c"
-#      "${NRF5_SDK_PATH}/components/softdevice/common/nrf_sdh.c"
-#      "${NRF5_SDK_PATH}/components/softdevice/common/nrf_sdh_ble.c"
-#      "${NRF5_SDK_PATH}/components/softdevice/common/nrf_sdh_freertos.c"
-#      "${NRF5_SDK_PATH}/components/softdevice/common/nrf_sdh_soc.c"
-#      "${NRF5_SDK_PATH}/components/libraries/experimental_section_vars/nrf_section_iter.c"
-#      "${NRF5_SDK_PATH}/components/libraries/bsp/bsp_btn_ble.c"
-#      "${NRF5_SDK_PATH}/components/libraries/hardfault/hardfault_implementation.c"
-#      "${NRF5_SDK_PATH}/components/libraries/hardfault/nrf52/handler/hardfault_handler_gcc.c"
-      )
-
     LIST(APPEND SDK_SOURCE_FILES
       "${NRF5_SDK_PATH}/modules/nrfx/drivers/src/nrfx_twi.c"
       )
 
-    # adds target for erasing and flashing the board with a softdevice
+    # adds target for erasing
     if(USE_JLINK)
-        add_custom_target(FLASH_SOFTDEVICE
-                COMMAND ${NRFJPROG} --program ${SOFTDEVICE_PATH} -f ${NRF_TARGET} --sectorerase
-                COMMAND sleep 0.5s
-                COMMAND ${NRFJPROG} --reset -f ${NRF_TARGET}
-                COMMENT "flashing SoftDevice"
-                )
-
         add_custom_target(FLASH_ERASE
                 COMMAND ${NRFJPROG} --eraseall -f ${NRF_TARGET}
                 COMMENT "erasing flashing"
                 )
     elseif(USE_GDB_CLIENT)
-        add_custom_target(FLASH_SOFTDEVICE
-          COMMAND ${GDB_CLIENT_BIN_PATH} -nx --batch -ex 'target extended-remote ${GDB_CLIENT_TARGET_REMOTE}' -ex 'monitor swdp_scan' -ex 'attach 1' -ex 'load' -ex 'kill'  ${SOFTDEVICE_PATH}
-          COMMENT "flashing SoftDevice"
-          )
         add_custom_target(FLASH_ERASE
           COMMAND ${GDB_CLIENT_BIN_PATH} -nx --batch -ex 'target extended-remote ${GDB_CLIENT_TARGET_REMOTE}' -ex 'monitor swdp_scan' -ex 'attach 1' -ex 'mon erase_mass'
           COMMENT "erasing flashing"
           )
     elseif(USE_OPENOCD)
-    add_custom_target(FLASH_SOFTDEVICE
-            COMMAND ${OPENOCD_BIN_PATH} -c "tcl_port disabled" -c "gdb_port 3333" -c "telnet_port 4444" -f interface/stlink.cfg -c 'transport select hla_swd' -f target/nrf52.cfg -c "program \"${SOFTDEVICE_PATH}\""  -c reset -c shutdown
-            COMMENT "flashing SoftDevice"
-            )
-    add_custom_target(FLASH_ERASE
+        add_custom_target(FLASH_ERASE
             COMMAND ${OPENOCD_BIN_PATH}  -f interface/stlink.cfg -c 'transport select hla_swd' -f target/nrf52.cfg -c init -c halt -c 'nrf5 mass_erase' -c reset -c shutdown
             COMMENT "erasing flashing"
             )
@@ -392,35 +301,6 @@ macro(nRF5x_addExecutable EXECUTABLE_NAME SOURCE_FILES)
             COMMAND ${CMAKE_OBJCOPY} -O ihex ${EXECUTABLE_NAME}.out "${EXECUTABLE_NAME}.hex"
             COMMENT "post build steps for ${EXECUTABLE_NAME}")
 
-    if(MERGEHEX)
-        add_custom_command(TARGET ${EXECUTABLE_NAME}
-          POST_BUILD
-          COMMAND ${MERGEHEX} --merge ${EXECUTABLE_NAME}.hex ${NRF5_SDK_PATH}/components/softdevice/s132/hex/s132_nrf52_6.1.1_softdevice.hex --output ${EXECUTABLE_NAME}-full.hex
-          COMMENT "merging HEX files")
-
-        if(USE_JLINK)
-            add_custom_target("FLASH_MERGED_${EXECUTABLE_NAME}"
-              DEPENDS ${EXECUTABLE_NAME}
-              COMMAND ${NRFJPROG} --program ${EXECUTABLE_NAME}-full.hex -f ${NRF_TARGET} --sectorerase
-              COMMAND sleep 0.5s
-              COMMAND ${NRFJPROG} --reset -f ${NRF_TARGET}
-              COMMENT "flashing ${EXECUTABLE_NAME}-full.hex"
-              )
-        elseif(USE_GDB_CLIENT)
-            add_custom_target("FLASH_MERGED_${EXECUTABLE_NAME}"
-              DEPENDS ${EXECUTABLE_NAME}
-              COMMAND ${GDB_CLIENT_BIN_PATH} -nx --batch -ex 'target extended-remote ${GDB_CLIENT_TARGET_REMOTE}' -ex 'monitor swdp_scan' -ex 'attach 1' -ex 'load' -ex 'kill'  ${EXECUTABLE_NAME}-full.hex
-              COMMENT "flashing ${EXECUTABLE_NAME}-full.hex"
-              )
-        elseif(USE_OPENOCD)
-            add_custom_target("FLASH_MERGED_${EXECUTABLE_NAME}"
-                DEPENDS ${EXECUTABLE_NAME}
-                COMMAND ${OPENOCD_BIN_PATH} -c "tcl_port disabled" -c "gdb_port 3333" -c "telnet_port 4444" -f interface/stlink.cfg -c 'transport select hla_swd' -f target/nrf52.cfg -c "program \"${EXECUTABLE_NAME}-full.hex\""  -c reset -c shutdown
-                COMMENT "flashing ${EXECUTABLE_NAME}-full.hex"
-            )
-        endif()
-    endif()
-
     # custom target for flashing the board
     if(USE_JLINK)
         add_custom_target("FLASH_${EXECUTABLE_NAME}"
diff --git a/src/Components/Ble/NimbleController.cpp b/src/Components/Ble/NimbleController.cpp
index 172bcb9f..2fe03571 100644
--- a/src/Components/Ble/NimbleController.cpp
+++ b/src/Components/Ble/NimbleController.cpp
@@ -126,14 +126,21 @@ void NimbleController::StartAdvertising() {
 
   int res;
   res = ble_gap_adv_set_fields(&fields);
-  ASSERT(res == 0);
+  //ASSERT(res == 0);
 
   res = ble_gap_adv_rsp_set_fields(&rsp_fields);
-  ASSERT(res == 0);
+  //ASSERT(res == 0);
 
   res = ble_gap_adv_start(addrType, NULL, 10000,
                           &adv_params, GAPEventCallback, this);
-  ASSERT(res == 0);
+  //ASSERT(res == 0);
+
+  // TODO I've disabled these ASSERT as they sometime asserts and reset the mcu.
+  // For now, the advertising is restarted as soon as it ends. There may be a race condition
+  // that prevent the advertising from restarting reliably.
+  // I remove the assert to prevent this uncesseray crash, but in the long term, the management of
+  // the advertising should be improve (better error handling, and advertise for 3 minutes after
+  // the application has been woken up, for example.
 }
 
 int OnAllSvrDisco(uint16_t conn_handle,
diff --git a/src/main.cpp b/src/main.cpp
index e0e9b65e..797495bb 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -195,7 +195,6 @@ void nimble_port_init(void) {
 }
 
 void nimble_port_ll_task_func(void *args) {
-//  extern void ble_ll_task(void *arg);
   ble_ll_task(args);
 }
 }