diff --git a/app/boards/arm/bdn9/bdn9_rev2.dts b/app/boards/arm/bdn9/bdn9_rev2.dts
index 2189530d4d2d..4b7366a42235 100644
--- a/app/boards/arm/bdn9/bdn9_rev2.dts
+++ b/app/boards/arm/bdn9/bdn9_rev2.dts
@@ -109,6 +109,9 @@ zephyr_udc0: &usb {
     status = "okay";
     pinctrl-0 = <&usb_dm_pa11 &usb_dp_pa12>;
     pinctrl-names = "default";
+
+    // Overriden to lower RAM usage.
+    num-bidir-endpoints = <4>;
 };
 
 &rtc {
diff --git a/app/boards/arm/bdn9/bdn9_rev2_defconfig b/app/boards/arm/bdn9/bdn9_rev2_defconfig
index 05087eeb4c65..8584059c6dc0 100644
--- a/app/boards/arm/bdn9/bdn9_rev2_defconfig
+++ b/app/boards/arm/bdn9/bdn9_rev2_defconfig
@@ -5,9 +5,6 @@ CONFIG_SOC_STM32F072XB=y
 # 72MHz system clock
 CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=72000000
 
-# Floating Point Options
-CONFIG_FPU=y
-
 # enable GPIO
 CONFIG_GPIO=y
 
@@ -17,10 +14,7 @@ CONFIG_PINCTRL=y
 # Poll to avoid interrupt overlap issues
 CONFIG_ZMK_KSCAN_DIRECT_POLLING=y
 
-# Needed to reduce this to size that will fit on F072
-CONFIG_HEAP_MEM_POOL_SIZE=1024
-
 # clock configuration
 CONFIG_CLOCK_CONTROL=y
 
-CONFIG_ZMK_USB=y
\ No newline at end of file
+CONFIG_ZMK_USB=y