diff --git a/locale/circuitpython.pot b/locale/circuitpython.pot
index d64cff18591d9..e44892fc3b54c 100644
--- a/locale/circuitpython.pot
+++ b/locale/circuitpython.pot
@@ -936,6 +936,10 @@ msgstr ""
 msgid "Filters too complex"
 msgstr ""
 
+#: ports/esp32s2/common-hal/dualbank/__init__.c
+msgid "Firmware image is invalid"
+msgstr ""
+
 #: ports/cxd56/common-hal/camera/Camera.c
 msgid "Format not supported"
 msgstr ""
@@ -1983,6 +1987,10 @@ msgstr ""
 msgid "Unsupported pull value."
 msgstr ""
 
+#: ports/esp32s2/common-hal/dualbank/__init__.c
+msgid "Update Failed"
+msgstr ""
+
 #: ports/nrf/common-hal/_bleio/Characteristic.c
 #: ports/nrf/common-hal/_bleio/Descriptor.c
 msgid "Value length != required fixed length"
@@ -3211,6 +3219,10 @@ msgstr ""
 msgid "offset is too large"
 msgstr ""
 
+#: shared-bindings/dualbank/__init__.c
+msgid "offset must be >= 0"
+msgstr ""
+
 #: py/objstr.c py/objstrunicode.c
 msgid "offset out of bounds"
 msgstr ""
diff --git a/ports/esp32s2/Makefile b/ports/esp32s2/Makefile
index 01f8f48a78ee4..35f82dd8a1492 100644
--- a/ports/esp32s2/Makefile
+++ b/ports/esp32s2/Makefile
@@ -106,6 +106,8 @@ INC += -isystem esp-idf/components/heap/include
 INC += -isystem esp-idf/components/esp_system/include
 INC += -isystem esp-idf/components/spi_flash/include
 INC += -isystem esp-idf/components/nvs_flash/include
+INC += -isystem esp-idf/components/app_update/include
+INC += -isystem esp-idf/components/bootloader_support/include
 INC += -I$(BUILD)/esp-idf/config
 
 CFLAGS += -DHAVE_CONFIG_H \
diff --git a/ports/esp32s2/common-hal/dualbank/__init__.c b/ports/esp32s2/common-hal/dualbank/__init__.c
new file mode 100644
index 0000000000000..0f468a036beb1
--- /dev/null
+++ b/ports/esp32s2/common-hal/dualbank/__init__.c
@@ -0,0 +1,139 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 microDev
+ *
+ * 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 "common-hal/dualbank/__init__.h"
+#include "shared-bindings/dualbank/__init__.h"
+
+#include <string.h>
+
+#include "esp_log.h"
+#include "esp_ota_ops.h"
+
+static const esp_partition_t *update_partition = NULL;
+static esp_ota_handle_t update_handle = 0;
+
+static const char *TAG = "dualbank";
+
+void dualbank_reset(void) {
+    // should use `abort` instead of `end`
+    // but not in idf v4.2
+    // esp_ota_abort(update_handle);
+    if (esp_ota_end(update_handle) == ESP_OK) {
+        update_handle = 0;
+        update_partition = NULL;
+    }
+}
+
+static void __attribute__((noreturn)) task_fatal_error(void) {
+    ESP_LOGE(TAG, "Exiting task due to fatal error...");
+    mp_raise_RuntimeError(translate("Update Failed"));
+}
+
+void common_hal_dualbank_flash(const void *buf, const size_t len, const size_t offset) {
+    esp_err_t err;
+
+    const esp_partition_t *running = esp_ota_get_running_partition();
+    const esp_partition_t *last_invalid = esp_ota_get_last_invalid_partition();
+
+    if (update_partition == NULL) {
+        update_partition = esp_ota_get_next_update_partition(NULL);
+
+        ESP_LOGI(TAG, "Running partition type %d subtype %d (offset 0x%08x)",
+                running->type, running->subtype, running->address);
+
+        ESP_LOGI(TAG, "Writing partition type %d subtype %d (offset 0x%08x)\n",
+                update_partition->type, update_partition->subtype, update_partition->address);
+
+        assert(update_partition != NULL);
+    }
+
+    if (update_handle == 0) {
+        if (len > sizeof(esp_image_header_t) + sizeof(esp_image_segment_header_t) + sizeof(esp_app_desc_t)) {
+            esp_app_desc_t new_app_info;
+            memcpy(&new_app_info, &((char *)buf)[sizeof(esp_image_header_t) + sizeof(esp_image_segment_header_t)], sizeof(esp_app_desc_t));
+            ESP_LOGI(TAG, "New firmware version: %s", new_app_info.version);
+
+            esp_app_desc_t running_app_info;
+            if (esp_ota_get_partition_description(running, &running_app_info) == ESP_OK) {
+                ESP_LOGI(TAG, "Running firmware version: %s", running_app_info.version);
+            }
+
+            esp_app_desc_t invalid_app_info;
+            if (esp_ota_get_partition_description(last_invalid, &invalid_app_info) == ESP_OK) {
+                ESP_LOGI(TAG, "Last invalid firmware version: %s", invalid_app_info.version);
+            }
+
+            // check new version with running version
+            if (memcmp(new_app_info.version, running_app_info.version, sizeof(new_app_info.version)) == 0) {
+                ESP_LOGW(TAG, "New version is the same as running version.");
+                task_fatal_error();
+            }
+
+            // check new version with last invalid partition
+            if (last_invalid != NULL) {
+                if (memcmp(new_app_info.version, invalid_app_info.version, sizeof(new_app_info.version)) == 0) {
+                    ESP_LOGW(TAG, "New version is the same as invalid version.");
+                    task_fatal_error();
+                }
+            }
+
+            err = esp_ota_begin(update_partition, OTA_WITH_SEQUENTIAL_WRITES, &update_handle);
+            if (err != ESP_OK) {
+                ESP_LOGE(TAG, "esp_ota_begin failed (%s)", esp_err_to_name(err));
+                task_fatal_error();
+            }
+        } else {
+            ESP_LOGE(TAG, "received package is not fit len");
+            task_fatal_error();
+        }
+    }
+
+    if (offset == 0) {
+        err = esp_ota_write(update_handle, buf, len);
+    } else {
+        err = esp_ota_write_with_offset(update_handle, buf, len, offset);
+    }
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "esp_ota_write failed (%s)", esp_err_to_name(err));
+        task_fatal_error();
+    }
+}
+
+void common_hal_dualbank_switch(void) {
+    if (esp_ota_end(update_handle) == ESP_OK) {
+        update_handle = 0;
+        update_partition = NULL;
+    }
+    esp_err_t err = esp_ota_set_boot_partition(esp_ota_get_next_update_partition(NULL));
+    if (err != ESP_OK) {
+        if (err == ESP_ERR_OTA_VALIDATE_FAILED) {
+            ESP_LOGE(TAG, "Image validation failed, image is corrupted");
+            mp_raise_RuntimeError(translate("Firmware image is invalid"));
+        }
+        ESP_LOGE(TAG, "esp_ota_set_boot_partition failed (%s)!", esp_err_to_name(err));
+        task_fatal_error();
+    }
+}
diff --git a/ports/esp32s2/common-hal/dualbank/__init__.h b/ports/esp32s2/common-hal/dualbank/__init__.h
new file mode 100644
index 0000000000000..8b18336c948b4
--- /dev/null
+++ b/ports/esp32s2/common-hal/dualbank/__init__.h
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 microDev
+ *
+ * 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.
+ */
+
+#ifndef MICROPY_INCLUDED_ESP32S2_COMMON_HAL_DUALBANK___INIT___H
+#define MICROPY_INCLUDED_ESP32S2_COMMON_HAL_DUALBANK___INIT___H
+
+extern void dualbank_reset(void);
+
+#endif //MICROPY_INCLUDED_ESP32S2_COMMON_HAL_DUALBANK___INIT___H
diff --git a/ports/esp32s2/mpconfigport.mk b/ports/esp32s2/mpconfigport.mk
index b3b2a6d70021f..2ad8afb51cd1e 100644
--- a/ports/esp32s2/mpconfigport.mk
+++ b/ports/esp32s2/mpconfigport.mk
@@ -19,6 +19,7 @@ CIRCUITPY_AUDIOBUSIO = 0
 CIRCUITPY_AUDIOIO = 0
 CIRCUITPY_CANIO = 1
 CIRCUITPY_COUNTIO = 1
+CIRCUITPY_DUALBANK = 1
 CIRCUITPY_FREQUENCYIO = 1
 CIRCUITPY_I2CPERIPHERAL = 0
 CIRCUITPY_ROTARYIO = 1
diff --git a/ports/esp32s2/supervisor/port.c b/ports/esp32s2/supervisor/port.c
index 7037b4f05132f..a56ac61c81b87 100644
--- a/ports/esp32s2/supervisor/port.c
+++ b/ports/esp32s2/supervisor/port.c
@@ -41,6 +41,7 @@
 #include "common-hal/busio/I2C.h"
 #include "common-hal/busio/SPI.h"
 #include "common-hal/busio/UART.h"
+#include "common-hal/dualbank/__init__.h"
 #include "common-hal/ps2io/Ps2.h"
 #include "common-hal/pulseio/PulseIn.h"
 #include "common-hal/pwmio/PWMOut.h"
@@ -123,6 +124,10 @@ void reset_port(void) {
     analogout_reset();
 #endif
 
+#if CIRCUITPY_DUALBANK
+    dualbank_reset();
+#endif
+
 #if CIRCUITPY_PS2IO
     ps2_reset();
 #endif
diff --git a/py/circuitpy_defns.mk b/py/circuitpy_defns.mk
index 1eafce2595f96..94f8ba42e76b2 100644
--- a/py/circuitpy_defns.mk
+++ b/py/circuitpy_defns.mk
@@ -205,6 +205,9 @@ endif
 ifeq ($(CIRCUITPY_OS),1)
 SRC_PATTERNS += os/%
 endif
+ifeq ($(CIRCUITPY_DUALBANK),1)
+SRC_PATTERNS += dualbank/%
+endif
 ifeq ($(CIRCUITPY_PIXELBUF),1)
 SRC_PATTERNS += _pixelbuf/%
 endif
@@ -348,6 +351,7 @@ SRC_COMMON_HAL_ALL = \
 	nvm/ByteArray.c \
 	nvm/__init__.c \
 	os/__init__.c \
+	dualbank/__init__.c \
 	ps2io/Ps2.c \
 	ps2io/__init__.c \
 	pulseio/PulseIn.c \
diff --git a/py/circuitpy_mpconfig.h b/py/circuitpy_mpconfig.h
index 0bd889ccdfbdf..08c92a77ef03a 100644
--- a/py/circuitpy_mpconfig.h
+++ b/py/circuitpy_mpconfig.h
@@ -539,6 +539,13 @@ extern const struct _mp_obj_module_t os_module;
 #define OS_MODULE_ALT_NAME
 #endif
 
+#if CIRCUITPY_DUALBANK
+extern const struct _mp_obj_module_t dualbank_module;
+#define DUALBANK_MODULE           { MP_OBJ_NEW_QSTR(MP_QSTR_dualbank), (mp_obj_t)&dualbank_module },
+#else
+#define DUALBANK_MODULE
+#endif
+
 #if CIRCUITPY_PEW
 extern const struct _mp_obj_module_t pew_module;
 #define PEW_MODULE          { MP_OBJ_NEW_QSTR(MP_QSTR__pew),(mp_obj_t)&pew_module },
@@ -827,6 +834,7 @@ extern const struct _mp_obj_module_t wifi_module;
     NETWORK_MODULE \
       SOCKET_MODULE \
       WIZNET_MODULE \
+    DUALBANK_MODULE \
     PEW_MODULE \
     PIXELBUF_MODULE \
     PS2IO_MODULE \
diff --git a/py/circuitpy_mpconfig.mk b/py/circuitpy_mpconfig.mk
index 370f13373904a..af1dccf0243f0 100644
--- a/py/circuitpy_mpconfig.mk
+++ b/py/circuitpy_mpconfig.mk
@@ -179,6 +179,9 @@ CFLAGS += -DCIRCUITPY_NVM=$(CIRCUITPY_NVM)
 CIRCUITPY_OS ?= 1
 CFLAGS += -DCIRCUITPY_OS=$(CIRCUITPY_OS)
 
+CIRCUITPY_DUALBANK ?= 0
+CFLAGS += -DCIRCUITPY_DUALBANK=$(CIRCUITPY_DUALBANK)
+
 CIRCUITPY_PIXELBUF ?= $(CIRCUITPY_FULL_BUILD)
 CFLAGS += -DCIRCUITPY_PIXELBUF=$(CIRCUITPY_PIXELBUF)
 
diff --git a/shared-bindings/dualbank/__init__.c b/shared-bindings/dualbank/__init__.c
new file mode 100644
index 0000000000000..8021ab18b937d
--- /dev/null
+++ b/shared-bindings/dualbank/__init__.c
@@ -0,0 +1,115 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 microDev
+ *
+ * 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 "shared-bindings/dualbank/__init__.h"
+
+//| """DUALBANK Module
+//|
+//| The `dualbank` module adds ability to update and switch
+//| between the two app partitions.
+//|
+//| There are two identical partitions, these contain different
+//| firmware versions.
+//| Having two partitions enables rollback functionality.
+//|
+//| The two partitions are defined as boot partition and
+//| next-update partition. Calling `dualbank.flash()` writes
+//| the next-update partition.
+//|
+//| After the next-update partition is written a validation
+//| check is performed and on a successful validation this
+//| partition is set as the boot partition. On next reset,
+//| firmware will be loaded from this partition.
+//|
+//| Here is the sequence of commands to follow:
+//|
+//| .. code-block:: python
+//|
+//|     import dualbank
+//|
+//|     dualbank.flash(buffer, offset)
+//|     dualbank.switch()
+//| """
+//| ...
+//|
+
+//| def flash(*buffer: ReadableBuffer, offset: int=0) -> None:
+//|     """Writes one of two app partitions at the given offset.
+//|
+//|     This can be called multiple times when flashing the firmware
+//|     in small chunks.
+//|     """
+//|     ...
+//|
+STATIC mp_obj_t dualbank_flash(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_buffer, ARG_offset };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_buffer, MP_ARG_OBJ | MP_ARG_REQUIRED },
+        { MP_QSTR_offset, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 0} },
+    };
+
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    if (args[ARG_offset].u_int < 0) {
+        mp_raise_ValueError(translate("offset must be >= 0"));
+    }
+
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(args[ARG_buffer].u_obj, &bufinfo, MP_BUFFER_READ);
+
+    common_hal_dualbank_flash(bufinfo.buf, bufinfo.len, args[ARG_offset].u_int);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_KW(dualbank_flash_obj, 0, dualbank_flash);
+
+//| def switch() -> None:
+//|     """Switches the boot partition.
+//|
+//|     On next reset, firmware will be loaded from the partition
+//|     just switched over to.
+//|     """
+//|     ...
+//|
+STATIC mp_obj_t dualbank_switch(void) {
+    common_hal_dualbank_switch();
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_0(dualbank_switch_obj, dualbank_switch);
+
+STATIC const mp_rom_map_elem_t dualbank_module_globals_table[] = {
+    // module name
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_dualbank) },
+    // module functions
+    { MP_ROM_QSTR(MP_QSTR_flash), MP_ROM_PTR(&dualbank_flash_obj) },
+    { MP_ROM_QSTR(MP_QSTR_switch), MP_ROM_PTR(&dualbank_switch_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(dualbank_module_globals, dualbank_module_globals_table);
+
+const mp_obj_module_t dualbank_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t*)&dualbank_module_globals,
+};
diff --git a/shared-bindings/dualbank/__init__.h b/shared-bindings/dualbank/__init__.h
new file mode 100644
index 0000000000000..7edbc6d68afd3
--- /dev/null
+++ b/shared-bindings/dualbank/__init__.h
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 microDev
+ *
+ * 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.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_DUALBANK___INIT___H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_DUALBANK___INIT___H
+
+#include "py/runtime.h"
+
+extern void common_hal_dualbank_switch(void);
+extern void common_hal_dualbank_flash(const void *buf, const size_t len, const size_t offset);
+
+#endif  // MICROPY_INCLUDED_SHARED_BINDINGS_DUALBANK___INIT___H