diff --git a/Makefile b/Makefile
index b5e6b29..dc5a0e5 100644
--- a/Makefile
+++ b/Makefile
@@ -7,31 +7,28 @@
 # - SD_VER1, SD_VER2, SD_VER3: SoftDevice version e.g 6.0.0
 # - SD_HEX   : to bootloader hex binary
 #******************************************************************************
-SRC_PATH        = src
+SRC_PATH     = src
 
-SDK_PATH        = lib/sdk/components
-SDK11_PATH      = lib/sdk11/components
-SD_PATH     		= lib/softdevice/$(SD_FILENAME)
+SDK_PATH     = lib/sdk/components
+SDK11_PATH   = lib/sdk11/components
+SD_PATH      = lib/softdevice/$(SD_FILENAME)
 
-TUSB_PATH       = lib/tinyusb/src
-NRFX_PATH				= lib/nrfx
+TUSB_PATH    = lib/tinyusb/src
+NRFX_PATH    = lib/nrfx
 
-SD_VER1         = 6
-SD_VER2         = 1
-SD_VER3         = 1
+SD_VER1      = 6
+SD_VER2      = 1
+SD_VER3      = 1
 
-SD_VERSION      = $(SD_VER1).$(SD_VER2).$(SD_VER3)
-SD_VERSION_FULL = $(SD_VERSION)
-SD_FILENAME		  = $(SD_NAME)_nrf52_$(SD_VERSION)
+SD_VERSION   = $(SD_VER1).$(SD_VER2).$(SD_VER3)
+SD_FILENAME  = $(SD_NAME)_nrf52_$(SD_VERSION)
+SD_API_PATH  = $(SD_PATH)/$(SD_FILENAME)_API
+SD_HEX       = $(SD_PATH)/$(SD_FILENAME)_softdevice.hex
 
+LD_FILE      = $(SRC_PATH)/linker/$(SD_NAME)_v$(SD_VER1).ld
 
-SD_API_PATH     = $(SD_PATH)/$(SD_FILENAME)_API
-SD_HEX          = $(SD_PATH)/$(SD_FILENAME)_softdevice.hex
-
-LD_FILE   			= $(SRC_PATH)/linker/$(SD_NAME)_v$(SD_VER1).ld
-
-MERGED_FNAME   = $(OUTPUT_FILENAME)_$(SD_NAME)_$(SD_VERSION_FULL)
-RELEASE_DIR     = bin/$(BOARD)/$(SD_VERSION_FULL)
+MERGED_FNAME = $(OUTPUT_FILENAME)_$(SD_NAME)_$(SD_VERSION)
+RELEASE_DIR  = bin/$(BOARD)/$(SD_VERSION)
 
 
 MK_DIS_FIRMWARE = "$(SD_NAME) $(SD_VERSION)"
@@ -45,7 +42,6 @@ OUTPUT_FILENAME = $(BOARD)_bootloader-$(GIT_VERSION)
 #******************************************************************************
 NRFUTIL = adafruit-nrfutil
 
-
 ifneq ($(JLINK),)
 NRFJPROG = nrfjprog -s $(JLINK)
 else
@@ -475,7 +471,6 @@ $(BUILD)/$(OUTPUT_FILENAME)-nosd.hex: $(BUILD)/$(OUTPUT_FILENAME)-nosd.out
 	@echo CR $(OUTPUT_FILENAME)-nosd.hex
 	$(QUIET)$(OBJCOPY) -O ihex $< $@
 
-
 # merge bootloader and sd hex together
 combinehex: $(BUILD)/$(MERGED_FNAME).hex
 
diff --git a/README.md b/README.md
index dc9aa89..971aaaa 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 This is a CDC/DFU/UF2 bootloader for nRF52 boards.
 
 - [Adafruit Feather nRF52832](https://www.adafruit.com/product/3406)
-- Adafruit Feather nRF52840 Express
+- [Adafruit Feather nRF52840 Express](https://www.adafruit.com/product/4062)
 - Nordic nRF52840DK PCA10056
 - Nordic nRF52840DK PCA10059 ("Dongle")
 - Particle Argon
diff --git a/lib/sdk11/components/libraries/bootloader_dfu/bootloader.c b/lib/sdk11/components/libraries/bootloader_dfu/bootloader.c
index a61739c..72d8d1b 100644
--- a/lib/sdk11/components/libraries/bootloader_dfu/bootloader.c
+++ b/lib/sdk11/components/libraries/bootloader_dfu/bootloader.c
@@ -136,8 +136,6 @@ static void wait_for_events(void)
     }
 #endif
 
-    led_tick();
-
     if ((m_update_status == BOOTLOADER_COMPLETE) ||
         (m_update_status == BOOTLOADER_TIMEOUT) ||
         (m_update_status == BOOTLOADER_RESET) )
diff --git a/src/boards.c b/src/boards.c
index 49f2a0a..0d6d30a 100644
--- a/src/boards.c
+++ b/src/boards.c
@@ -80,10 +80,17 @@ void board_init(void)
 
   // Init app timer (use RTC1)
   app_timer_init();
+
+  // Configure Systick for led blinky
+  extern uint32_t SystemCoreClock;
+  SysTick_Config(SystemCoreClock/1000);
 }
 
 void board_teardown(void)
 {
+  // Disable systick, turn off LEDs
+  SysTick->CTRL = 0;
+
   // Disable and reset PWM for LEDs
   led_pwm_teardown();
 
@@ -104,12 +111,20 @@ void board_teardown(void)
   NRF_CLOCK->TASKS_LFCLKSTOP = 1UL;
 }
 
+static uint32_t _systick_count = 0;
+void SysTick_Handler(void)
+{
+  _systick_count++;
+
+  led_tick();
+}
+
+
 uint32_t tusb_hal_millis(void)
 {
   return ( ( ((uint64_t)app_timer_cnt_get())*1000*(APP_TIMER_CONFIG_RTC_FREQUENCY+1)) / APP_TIMER_CLOCK_FREQ );
 }
 
-
 void pwm_teardown(NRF_PWM_Type* pwm )
 {
   pwm->TASKS_SEQSTART[0] = 0;
@@ -126,7 +141,7 @@ void pwm_teardown(NRF_PWM_Type* pwm )
   pwm->SEQ[0].CNT  = 0;
 }
 
-static uint16_t led_duty_cycles[PWM0_CH_NUM];
+static uint16_t led_duty_cycles[PWM0_CH_NUM] = { 0 };
 
 #if LEDS_NUMBER > PWM0_CH_NUM
 #error "Only " PWM0_CH_NUM " concurrent status LEDs are supported."
@@ -136,10 +151,13 @@ void led_pwm_init(uint32_t led_index, uint32_t led_pin)
 {
   NRF_PWM_Type* pwm    = NRF_PWM0;
 
+  pwm->ENABLE = 0;
+
   nrf_gpio_cfg_output(led_pin);
+  nrf_gpio_pin_write(led_pin, 1 - LED_STATE_ON);
+
   pwm->PSEL.OUT[led_index] = led_pin;
 
-  pwm->ENABLE = 1;
   pwm->MODE            = PWM_MODE_UPDOWN_Up;
   pwm->COUNTERTOP      = 0xff;
   pwm->PRESCALER       = PWM_PRESCALER_PRESCALER_DIV_16;
@@ -150,8 +168,11 @@ void led_pwm_init(uint32_t led_index, uint32_t led_pin)
   pwm->SEQ[0].CNT      = 4; // default mode is Individual --> count must be 4
   pwm->SEQ[0].REFRESH  = 0;
   pwm->SEQ[0].ENDDELAY = 0;
-  pwm->LOOP = 0;
-  pwm->TASKS_SEQSTART[0] = 1;
+
+  pwm->ENABLE = 1;
+
+  pwm->EVENTS_SEQEND[0] = 0;
+//  pwm->TASKS_SEQSTART[0] = 1;
 }
 
 void led_pwm_teardown(void)
@@ -171,7 +192,7 @@ static uint32_t primary_cycle_length;
 static uint32_t secondary_cycle_length;
 #endif
 void led_tick() {
-    uint32_t millis = tusb_hal_millis();
+    uint32_t millis = _systick_count;
 
     uint32_t cycle = millis % primary_cycle_length;
     uint32_t half_cycle = primary_cycle_length / 2;
@@ -207,19 +228,25 @@ void led_state(uint32_t state)
     switch (state) {
         case STATE_USB_MOUNTED:
           new_rgb_color = 0x00ff00;
-          primary_cycle_length = 4000;
+          primary_cycle_length = 3000;
           break;
+
         case STATE_BOOTLOADER_STARTED:
         case STATE_USB_UNMOUNTED:
           new_rgb_color = 0xff0000;
           primary_cycle_length = 300;
           break;
+
         case STATE_WRITING_STARTED:
           temp_color = 0xff0000;
+          primary_cycle_length = 100;
           break;
+
         case STATE_WRITING_FINISHED:
           // Empty means to unset any temp colors.
+          primary_cycle_length = 3000;
           break;
+
         case STATE_BLE_CONNECTED:
           new_rgb_color = 0x0000ff;
           #ifdef LED_SECONDARY_PIN
@@ -228,6 +255,7 @@ void led_state(uint32_t state)
           primary_cycle_length = 500;
           #endif
           break;
+
         case STATE_BLE_DISCONNECTED:
           new_rgb_color = 0xff00ff;
           #ifdef LED_SECONDARY_PIN
@@ -236,6 +264,7 @@ void led_state(uint32_t state)
           primary_cycle_length = 300;
           #endif
           break;
+
         default:
         break;
     }
@@ -260,7 +289,7 @@ void led_state(uint32_t state)
     #endif
 }
 
-#if LED_NEOPIXEL
+#ifdef LED_NEOPIXEL
 
 // WS2812B (rev B) timing is 0.4 and 0.8 us
 #define MAGIC_T0H               6UL | (0x8000) // 0.375us
diff --git a/src/boards.h b/src/boards.h
index 514801c..68b236c 100644
--- a/src/boards.h
+++ b/src/boards.h
@@ -108,8 +108,6 @@ static inline bool button_pressed(uint32_t pin)
   return (nrf_gpio_pin_read(pin) == 0) ? true : false;
 }
 
-
-
 bool is_ota(void);
 
 #endif
diff --git a/src/main.c b/src/main.c
index bd8ae5d..8ac1dba 100644
--- a/src/main.c
+++ b/src/main.c
@@ -71,7 +71,7 @@ void usb_teardown(void);
 
 #else
 
-#define usb_init(x)
+#define usb_init(x)       led_state(STATE_USB_MOUNTED) // mark nrf52832 as mounted
 #define usb_teardown()
 
 #endif
@@ -167,6 +167,8 @@ int main(void)
   board_init();
   bootloader_init();
 
+  led_state(STATE_BOOTLOADER_STARTED);
+
   // When updating SoftDevice, bootloader will reset before swapping SD
   if (bootloader_dfu_sd_in_progress())
   {
@@ -209,8 +211,6 @@ int main(void)
 
   (*dbl_reset_mem) = 0;
 
-  led_state(STATE_BOOTLOADER_STARTED);
-
   if ( dfu_start || !valid_app )
   {
     if ( _ota_dfu )
@@ -222,7 +222,6 @@ int main(void)
     else
     {
       led_state(STATE_USB_UNMOUNTED);
-      // otherwise USB for Serial & UF2
       usb_init(serial_only_dfu);
     }
 
diff --git a/src/segger/Adafruit_nRF52_Bootloader.emProject b/src/segger/Adafruit_nRF52_Bootloader.emProject
index 85acfb2..b3d4adc 100644
--- a/src/segger/Adafruit_nRF52_Bootloader.emProject
+++ b/src/segger/Adafruit_nRF52_Bootloader.emProject
@@ -18,7 +18,7 @@
       arm_target_debug_interface_type="ADIv5"
       arm_target_device_name="nRF52840_xxAA"
       arm_target_interface_type="SWD"
-      c_preprocessor_definitions="__nRF_FAMILY;ARM_MATH_CM4;FLASH_PLACEMENT=1;NO_VTOR_CONFIG;MK_BOOTLOADER_VERSION=0x06010000;CONFIG_GPIO_AS_PINRESET;BLE_STACK_SUPPORT_REQD;SWI_DISABLE0;SOFTDEVICE_PRESENT;FLOAT_ABI_HARD;CFG_TUSB_DEBUG=2"
+      c_preprocessor_definitions="__nRF_FAMILY;ARM_MATH_CM4;FLASH_PLACEMENT=1;NO_VTOR_CONFIG;MK_BOOTLOADER_VERSION=0x06010000;CONFIG_GPIO_AS_PINRESET;BLE_STACK_SUPPORT_REQD;SWI_DISABLE0;SOFTDEVICE_PRESENT;FLOAT_ABI_HARD;CFG_TUSB_DEBUG=2;UF2_VERSION=&quot;Segger&quot;"
       c_user_include_directories="../;../usb;../cmsis/include;$(tusbDir);$(nrfxDir);$(nrfxDir)/mdk;$(nrfxDir)/hal;$(nrfxDir)/drivers/include;$(sdDir)/include;$(sdDir)/include/nrf52;$(sdk11Dir)/drivers_nrf/pstorage;$(sdk11Dir)/ble/common/;$(sdk11Dir)/ble/ble_services/ble_dfu;$(sdk11Dir)/ble/ble_services/ble_dis;$(sdk11Dir)/libraries/bootloader_dfu;$(sdk11Dir)/libraries/bootloader_dfu/hci_transport;$(sdk11Dir)/libraries/util;$(sdkDir)/toolchain/cmsis/include;$(sdkDir)/device;$(sdkDir)/toolchain;$(sdkDir)/drivers_nrf/hal;$(sdkDir)/drivers_nrf/systick;$(sdkDir)/drivers_nrf/uart;$(sdkDir)/drivers_nrf/usbd;$(sdkDir)/drivers_nrf/common;$(sdkDir)/drivers_nrf/delay;$(sdkDir)/drivers_nrf/power;$(sdkDir)/drivers_nrf/clock;$(sdkDir)/libraries/util;$(sdkDir)/libraries/timer;$(sdkDir)/libraries/scheduler;$(sdkDir)/libraries/crc16;$(sdkDir)/libraries/util;$(sdkDir)/libraries/hci/config;$(sdkDir)/libraries/uart;$(sdkDir)/libraries/hci;$(sdkDir)/external/fprintf;$(sdkDir)/libraries/strerror;$(sdkDir)/libraries/atomic;$(sdkDir)/libraries/balloc;$(sdkDir)/libraries/experimental_log/src;$(sdkDir)/libraries/experimental_log;$(sdkDir)/libraries/experimental_section_vars;$(sdkDir)/libraries/experimental_memobj"
       debug_register_definition_file="$(ProjectDir)/nrf52840_Registers.xml"
       debug_target_connection="J-Link"