diff --git a/Firmware/Microbit_v1/Makefile b/Firmware/Microbit_v1/Makefile
index 4d3155d..862e42e 100644
--- a/Firmware/Microbit_v1/Makefile
+++ b/Firmware/Microbit_v1/Makefile
@@ -1,7 +1,7 @@
 PLATFORM := nRF51822
 NRF51_SDK_PATH := $(shell pwd)/nrf51_sdk_v4_4_2_33551
 NRF51_SDK_DOWNLOAD_URL := https://developer.nordicsemi.com/nRF5_SDK/nRF51_SDK_v4.x.x/nrf51_sdk_v4_4_2_33551.zip
-OPENHAYSTACK_FIRMWARE_PATH := $(shell pwd)/../OpenHaystack/OpenHaystack/HaystackApp/firmware.bin
+OPENHAYSTACK_FIRMWARE_PATH := $(shell pwd)/../../OpenHaystack/OpenHaystack/HaystackApp/Firmwares/Microbit/firmware.bin
 
 export PLATFORM
 export NRF51_SDK_PATH
@@ -10,7 +10,7 @@ ifeq ($(DEPLOY_PATH),)
 	DEPLOY_PATH := /Volumes/MICROBIT
 endif
 
-offline-finding/build/offline-finding.bin: $(NRF51_SDK_PATH) blessed/.git
+offline-finding/build/offline-finding.bin: $(NRF51_SDK_PATH) blessed/.git offline-finding/main.c
 	$(MAKE) -C blessed
 	$(MAKE) -C offline-finding
 
diff --git a/Firmware/Microbit_v1/offline-finding/main.c b/Firmware/Microbit_v1/offline-finding/main.c
index f42567f..8953f01 100644
--- a/Firmware/Microbit_v1/offline-finding/main.c
+++ b/Firmware/Microbit_v1/offline-finding/main.c
@@ -15,7 +15,7 @@
 
 #include "ll.h"
 
-#define ADV_INTERVAL			LL_ADV_INTERVAL_MIN_NONCONN	/* 100 ms */
+#define ADV_INTERVAL			2000000	/* 2 s */
 
 /* don't make `const` so we can replace key in compiled binary image */
 static char public_key[28] = "OFFLINEFINDINGPUBLICKEYHERE!";
diff --git a/OpenHaystack/OpenHaystack/HaystackApp/Firmwares/Microbit/firmware.bin b/OpenHaystack/OpenHaystack/HaystackApp/Firmwares/Microbit/firmware.bin
old mode 100644
new mode 100755
index ce4f816..776b8fc
Binary files a/OpenHaystack/OpenHaystack/HaystackApp/Firmwares/Microbit/firmware.bin and b/OpenHaystack/OpenHaystack/HaystackApp/Firmwares/Microbit/firmware.bin differ