diff --git a/ports/nrf/boards/challenger_840/board.c b/ports/nrf/boards/challenger_840/board.c
index fb1ce4fb83..14a52fc4de 100644
--- a/ports/nrf/boards/challenger_840/board.c
+++ b/ports/nrf/boards/challenger_840/board.c
@@ -23,7 +23,3 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-
-#include "supervisor/board.h"
-
-// Use the MP_WEAK supervisor/shared/board.c versions of routines not defined here.
diff --git a/ports/nrf/boards/challenger_840/challenger_840.py b/ports/nrf/boards/challenger_840/challenger_840.py
new file mode 100644
index 0000000000..bf3ae77170
--- /dev/null
+++ b/ports/nrf/boards/challenger_840/challenger_840.py
@@ -0,0 +1,16 @@
+import board
+import digitalio
+
+_LDO_PIN = digitalio.DigitalInOut(board.LDO_CONTROL)
+_LDO_PIN.direction = digitalio.Direction.OUTPUT
+_LDO_PIN.value = True
+
+
+def ldo_on():
+    global _LDO_PIN
+    _LDO_PIN.value = True
+
+
+def ldo_off():
+    global _LDO_PIN
+    _LDO_PIN.value = False
diff --git a/ports/nrf/boards/challenger_840/mpconfigboard.mk b/ports/nrf/boards/challenger_840/mpconfigboard.mk
index ddb55ce705..03cbc20b21 100644
--- a/ports/nrf/boards/challenger_840/mpconfigboard.mk
+++ b/ports/nrf/boards/challenger_840/mpconfigboard.mk
@@ -6,4 +6,8 @@ USB_MANUFACTURER = "Invector Labs AB"
 MCU_CHIP = nrf52840
 
 SPI_FLASH_FILESYSTEM = 1
-EXTERNAL_FLASH_DEVICES = "W25Q16JVxQ,W25Q32FV,W25Q64FV"
+EXTERNAL_FLASH_DEVICES = "W25Q16JVxQ,W25Q32FV,W25Q32JVxQ,W25Q64FV,W25Q64JVxQ"
+
+FROZEN_MPY_DIRS += $(TOP)/ports/nrf/boards/challenger_840
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_BLE
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_NeoPixel
diff --git a/ports/nrf/boards/challenger_840/pins.c b/ports/nrf/boards/challenger_840/pins.c
index 26d780fffe..e059c17a15 100644
--- a/ports/nrf/boards/challenger_840/pins.c
+++ b/ports/nrf/boards/challenger_840/pins.c
@@ -32,6 +32,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_P0_06) },
 
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_P1_08) },
+    { MP_ROM_QSTR(MP_QSTR_LDO_CONTROL), MP_ROM_PTR(&pin_P1_09) },
 
     { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_P0_12) },
     { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_P0_11) },