diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8e72a40219..046598a6e2 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -318,7 +318,8 @@ jobs:
         - "teensy40"
         - "teensy41"
         - "teknikio_bluebird"
-        - "thunderpack"
+        - "thunderpack_v11"
+        - "thunderpack_v12"
         - "tinkeringtech_scoutmakes_azul"
         - "trellis_m4_express"
         - "trinket_m0"
diff --git a/ports/stm/boards/STM32F411_nvm_nofs.ld b/ports/stm/boards/STM32F411_nvm_nofs.ld
new file mode 100644
index 0000000000..e4630518cd
--- /dev/null
+++ b/ports/stm/boards/STM32F411_nvm_nofs.ld
@@ -0,0 +1,27 @@
+/*
+    GNU linker script for STM32F411 with nvm and an external flash chip.
+    No space is reserved for a filesystem.
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)          : ORIGIN = 0x08000000, LENGTH = 512K /* entire flash */
+    FLASH_ISR (rx)      : ORIGIN = 0x08000000, LENGTH = 16K /* sector 0 */
+    FLASH_NVM (rwx)     : ORIGIN = 0x08004000, LENGTH = 16K /* sector 1 is 16K */
+    FLASH_FIRMWARE (rx) : ORIGIN = 0x08008000, LENGTH = 480K /* sector 2,3 is 16k, sector 4 is 64K, sectors 5,6,7 are 128K */
+    RAM (xrw)           : ORIGIN = 0x20000000, LENGTH = 128K
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 24K;
+_minimum_heap_size = 16K;
+
+/* Define the top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
diff --git a/ports/stm/boards/thunderpack/board.c b/ports/stm/boards/thunderpack_v11/board.c
similarity index 100%
rename from ports/stm/boards/thunderpack/board.c
rename to ports/stm/boards/thunderpack_v11/board.c
diff --git a/ports/stm/boards/thunderpack/mpconfigboard.h b/ports/stm/boards/thunderpack_v11/mpconfigboard.h
similarity index 97%
rename from ports/stm/boards/thunderpack/mpconfigboard.h
rename to ports/stm/boards/thunderpack_v11/mpconfigboard.h
index c2649e2555..7d4a8dff32 100644
--- a/ports/stm/boards/thunderpack/mpconfigboard.h
+++ b/ports/stm/boards/thunderpack_v11/mpconfigboard.h
@@ -23,7 +23,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-#define MICROPY_HW_BOARD_NAME       "THUNDERPACK"
+#define MICROPY_HW_BOARD_NAME       "THUNDERPACK_v11"
 #define MICROPY_HW_MCU_NAME         "STM32F411CE"
 
 // Non-volatile memory config
diff --git a/ports/stm/boards/thunderpack/mpconfigboard.mk b/ports/stm/boards/thunderpack_v11/mpconfigboard.mk
similarity index 100%
rename from ports/stm/boards/thunderpack/mpconfigboard.mk
rename to ports/stm/boards/thunderpack_v11/mpconfigboard.mk
diff --git a/ports/stm/boards/thunderpack/pins.c b/ports/stm/boards/thunderpack_v11/pins.c
similarity index 100%
rename from ports/stm/boards/thunderpack/pins.c
rename to ports/stm/boards/thunderpack_v11/pins.c
diff --git a/ports/stm/boards/thunderpack_v12/board.c b/ports/stm/boards/thunderpack_v12/board.c
new file mode 100644
index 0000000000..4421970eef
--- /dev/null
+++ b/ports/stm/boards/thunderpack_v12/board.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+
+void board_init(void) {
+}
+
+bool board_requests_safe_mode(void) {
+  return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/thunderpack_v12/mpconfigboard.h b/ports/stm/boards/thunderpack_v12/mpconfigboard.h
new file mode 100644
index 0000000000..fb5f389a37
--- /dev/null
+++ b/ports/stm/boards/thunderpack_v12/mpconfigboard.h
@@ -0,0 +1,57 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#define MICROPY_HW_BOARD_NAME       "THUNDERPACK_v12"
+#define MICROPY_HW_MCU_NAME         "STM32F411CE"
+
+// Non-volatile memory config
+#define CIRCUITPY_INTERNAL_NVM_SIZE          (0x4000)
+#define CIRCUITPY_INTERNAL_NVM_START_ADDR    (0x08004000)
+#define CIRCUITPY_INTERNAL_NVM_SECTOR        FLASH_SECTOR_1
+#define NVM_BYTEARRAY_BUFFER_SIZE            512
+
+// Flash config
+#define FLASH_SIZE                           (0x80000)
+#define FLASH_PAGE_SIZE                      (0x4000)
+#define BOARD_FLASH_SIZE                     (FLASH_SIZE - CIRCUITPY_INTERNAL_NVM_SIZE- 0x2000 - 0xC000)
+#define INTERNAL_FLASH_FILESYSTEM_SIZE       0x8000
+
+// On-board flash
+#define SPI_FLASH_MOSI_PIN          (&pin_PB15)
+#define SPI_FLASH_MISO_PIN          (&pin_PB14)
+#define SPI_FLASH_SCK_PIN           (&pin_PB13)
+#define SPI_FLASH_CS_PIN            (&pin_PB12)
+
+#define HSE_VALUE                   ((uint32_t)24000000U)
+#define BOARD_OVERWRITE_SWD         (1)
+#define BOARD_NO_VBUS_SENSE         (1)
+#define BOARD_HAS_LOW_SPEED_CRYSTAL (0)
+
+// Status LEDs
+#define MICROPY_HW_APA102_MOSI      (&pin_PB08)
+#define MICROPY_HW_APA102_SCK       (&pin_PB00)
+// I2C
+#define DEFAULT_I2C_BUS_SCL         (&pin_PB06)
+#define DEFAULT_I2C_BUS_SDA         (&pin_PB07)
diff --git a/ports/stm/boards/thunderpack_v12/mpconfigboard.mk b/ports/stm/boards/thunderpack_v12/mpconfigboard.mk
new file mode 100644
index 0000000000..a2e1da1011
--- /dev/null
+++ b/ports/stm/boards/thunderpack_v12/mpconfigboard.mk
@@ -0,0 +1,21 @@
+USB_VID = 0x239A
+USB_PID = 0x8071
+USB_PRODUCT = "Thunderpack STM32F411"
+USB_MANUFACTURER = "Jeremy Gillick"
+USB_DEVICES = "CDC,MSC"
+
+LONGINT_IMPL = NONE
+
+SPI_FLASH_FILESYSTEM = 1
+EXTERNAL_FLASH_DEVICE_COUNT = 1
+EXTERNAL_FLASH_DEVICES = GD25Q16C
+
+CIRCUITPY_NVM = 1
+CIRCUITPY_BLEIO_HCI = 0
+
+MCU_SERIES = F4
+MCU_VARIANT = STM32F411xE
+MCU_PACKAGE = UFQFPN48
+
+LD_COMMON = boards/common_nvm.ld
+LD_FILE = boards/STM32F411_nvm_nofs.ld
diff --git a/ports/stm/boards/thunderpack_v12/pins.c b/ports/stm/boards/thunderpack_v12/pins.c
new file mode 100644
index 0000000000..1e07621eaa
--- /dev/null
+++ b/ports/stm/boards/thunderpack_v12/pins.c
@@ -0,0 +1,39 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_PA0), MP_ROM_PTR(&pin_PA00) },
+    { MP_ROM_QSTR(MP_QSTR_PA1), MP_ROM_PTR(&pin_PA01) },
+    { MP_ROM_QSTR(MP_QSTR_PA2), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_PA3), MP_ROM_PTR(&pin_PA03) },
+    { MP_ROM_QSTR(MP_QSTR_PA4), MP_ROM_PTR(&pin_PA04) },
+    { MP_ROM_QSTR(MP_QSTR_PA5), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_PA6), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_PA7), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_PA8), MP_ROM_PTR(&pin_PA08) },
+    { MP_ROM_QSTR(MP_QSTR_PA9), MP_ROM_PTR(&pin_PA09) },
+    { MP_ROM_QSTR(MP_QSTR_PA10), MP_ROM_PTR(&pin_PA10) },
+    { MP_ROM_QSTR(MP_QSTR_PA13), MP_ROM_PTR(&pin_PA13) },
+    { MP_ROM_QSTR(MP_QSTR_PA14), MP_ROM_PTR(&pin_PA14) },
+
+    { MP_ROM_QSTR(MP_QSTR_PB0), MP_ROM_PTR(&pin_PB00) },
+    { MP_ROM_QSTR(MP_QSTR_PB5), MP_ROM_PTR(&pin_PB05) },
+    { MP_ROM_QSTR(MP_QSTR_PB6), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_PB7), MP_ROM_PTR(&pin_PB07) },
+    { MP_ROM_QSTR(MP_QSTR_PB8), MP_ROM_PTR(&pin_PB08) },
+
+    { MP_ROM_QSTR(MP_QSTR_LED1), MP_ROM_PTR(&pin_PA00) },
+    { MP_ROM_QSTR(MP_QSTR_LED2), MP_ROM_PTR(&pin_PA01) },
+    { MP_ROM_QSTR(MP_QSTR_LED3), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_LED4), MP_ROM_PTR(&pin_PA03) },
+
+    { MP_ROM_QSTR(MP_QSTR_BUTTON), MP_ROM_PTR(&pin_PB04) },
+
+    { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PB07) },
+
+    { MP_ROM_QSTR(MP_QSTR_APA102_MOSI), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_APA102_SCK),  MP_ROM_PTR(&pin_PB00) },
+
+    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/common-hal/microcontroller/Pin.c b/ports/stm/common-hal/microcontroller/Pin.c
index 9965132703..0e333c71cf 100644
--- a/ports/stm/common-hal/microcontroller/Pin.c
+++ b/ports/stm/common-hal/microcontroller/Pin.c
@@ -35,6 +35,10 @@
 #ifdef MICROPY_HW_NEOPIXEL
 bool neopixel_in_use;
 #endif
+#if defined(MICROPY_HW_APA102_MOSI) && defined(MICROPY_HW_APA102_SCK)
+bool apa102_sck_in_use;
+bool apa102_mosi_in_use;
+#endif
 
 #if defined(TFBGA216)
     GPIO_TypeDef * ports[] = {GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, GPIOF, GPIOG, GPIOH, GPIOI, GPIOJ, GPIOK};
@@ -66,6 +70,10 @@ void reset_all_pins(void) {
     #ifdef MICROPY_HW_NEOPIXEL
     neopixel_in_use = false;
     #endif
+    #if defined(MICROPY_HW_APA102_MOSI) && defined(MICROPY_HW_APA102_SCK)
+    apa102_sck_in_use = false;
+    apa102_mosi_in_use = false;
+    #endif
 }
 
 // Mark pin as free and return it to a quiescent state.
@@ -89,6 +97,18 @@ void reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
         return;
     }
     #endif
+    #if defined(MICROPY_HW_APA102_MOSI) && defined(MICROPY_HW_APA102_SCK)
+    if (
+        (pin_port == MICROPY_HW_APA102_MOSI->port && pin_number == MICROPY_HW_APA102_MOSI->number)
+        || (pin_port == MICROPY_HW_APA102_SCK->port && pin_number == MICROPY_HW_APA102_MOSI->number)
+    )
+    {
+        apa102_mosi_in_use = false;
+        apa102_sck_in_use = false;
+        rgb_led_status_init();
+        return;
+    }
+    #endif
 }
 
 void never_reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
@@ -123,6 +143,16 @@ bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
         return !neopixel_in_use;
     }
     #endif
+    #if defined(MICROPY_HW_APA102_MOSI) && defined(MICROPY_HW_APA102_SCK)
+    if (pin == MICROPY_HW_APA102_MOSI)
+    {
+        return !apa102_mosi_in_use;
+    }
+    if (pin == MICROPY_HW_APA102_SCK)
+    {
+        return !apa102_sck_in_use;
+    }
+    #endif
 
     return pin_number_is_free(pin->port, pin->number);
 }
@@ -146,6 +176,16 @@ void common_hal_mcu_pin_claim(const mcu_pin_obj_t* pin) {
         neopixel_in_use = true;
     }
     #endif
+    #if defined(MICROPY_HW_APA102_MOSI) && defined(MICROPY_HW_APA102_SCK)
+    if (pin == MICROPY_HW_APA102_MOSI)
+    {
+        apa102_mosi_in_use = true;
+    }
+    if (pin == MICROPY_HW_APA102_SCK)
+    {
+        apa102_sck_in_use = true;
+    }
+    #endif
 }
 
 void common_hal_mcu_pin_reset_number(uint8_t pin_no) {
diff --git a/ports/stm/common-hal/nvm/ByteArray.c b/ports/stm/common-hal/nvm/ByteArray.c
index 462d3aa9de..b7a1ff0351 100644
--- a/ports/stm/common-hal/nvm/ByteArray.c
+++ b/ports/stm/common-hal/nvm/ByteArray.c
@@ -48,7 +48,7 @@ bool common_hal_nvm_bytearray_set_bytes(nvm_bytearray_obj_t *self,
 
     // Erase flash sector
     HAL_FLASH_Unlock();
-    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | FLASH_FLAG_PGSERR );
+    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_PGSERR );
     FLASH_Erase_Sector(CIRCUITPY_INTERNAL_NVM_SECTOR, VOLTAGE_RANGE_3);
 
     // Write bytes to flash
diff --git a/ports/stm/supervisor/internal_flash.h b/ports/stm/supervisor/internal_flash.h
index ad5cba62d8..19ae03e0b3 100644
--- a/ports/stm/supervisor/internal_flash.h
+++ b/ports/stm/supervisor/internal_flash.h
@@ -41,8 +41,12 @@
 
 #ifdef STM32F411xE
 #define STM32_FLASH_SIZE 0x80000 //512KiB
-#define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //48KiB
-#define INTERNAL_FLASH_FILESYSTEM_START_ADDR 0x08004000
+#ifndef INTERNAL_FLASH_FILESYSTEM_SIZE
+  #define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //48KiB
+#endif
+#ifndef INTERNAL_FLASH_FILESYSTEM_START_ADDR
+  #define INTERNAL_FLASH_FILESYSTEM_START_ADDR 0x08004000
+#endif
 #endif
 
 #ifdef STM32F412Zx