diff --git a/locale/circuitpython.pot b/locale/circuitpython.pot
index 17807450a9..6c5e5ee585 100644
--- a/locale/circuitpython.pot
+++ b/locale/circuitpython.pot
@@ -1005,7 +1005,15 @@ msgid "Filters too complex"
 msgstr ""
 
 #: ports/espressif/common-hal/dualbank/__init__.c
-msgid "Firmware image is invalid"
+msgid "Firmware is duplicate"
+msgstr ""
+
+#: ports/espressif/common-hal/dualbank/__init__.c
+msgid "Firmware is invalid"
+msgstr ""
+
+#: ports/espressif/common-hal/dualbank/__init__.c
+msgid "Firmware is too big"
 msgstr ""
 
 #: shared-bindings/bitmaptools/__init__.c
@@ -4155,7 +4163,7 @@ msgstr ""
 msgid "unexpected keyword argument"
 msgstr ""
 
-#: py/bc.c py/objnamedtuple.c
+#: py/bc.c py/objnamedtuple.c shared-bindings/traceback/__init__.c
 msgid "unexpected keyword argument '%q'"
 msgstr ""
 
diff --git a/ports/espressif/common-hal/dualbank/__init__.c b/ports/espressif/common-hal/dualbank/__init__.c
index 29b15a3e30..9e3fb38627 100644
--- a/ports/espressif/common-hal/dualbank/__init__.c
+++ b/ports/espressif/common-hal/dualbank/__init__.c
@@ -32,8 +32,6 @@
 #include "esp_log.h"
 #include "esp_ota_ops.h"
 
-#include "supervisor/flash.h"
-
 static const esp_partition_t *update_partition = NULL;
 static esp_ota_handle_t update_handle = 0;
 
@@ -59,14 +57,13 @@ void common_hal_dualbank_flash(const void *buf, const size_t len, const size_t o
 
     if (update_partition == NULL) {
         update_partition = esp_ota_get_next_update_partition(NULL);
+        assert(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) {
@@ -88,14 +85,14 @@ void common_hal_dualbank_flash(const void *buf, const size_t len, const size_t o
             // 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();
+                mp_raise_RuntimeError(translate("Firmware is duplicate"));
             }
 
             // 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();
+                    mp_raise_RuntimeError(translate("Firmware is invalid"));
                 }
             }
 
@@ -106,7 +103,7 @@ void common_hal_dualbank_flash(const void *buf, const size_t len, const size_t o
             }
         } else {
             ESP_LOGE(TAG, "received package is not fit len");
-            task_fatal_error();
+            mp_raise_RuntimeError(translate("Firmware is too big"));
         }
     }
 
@@ -130,7 +127,7 @@ void common_hal_dualbank_switch(void) {
     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"));
+            mp_raise_RuntimeError(translate("Firmware is invalid"));
         }
         ESP_LOGE(TAG, "esp_ota_set_boot_partition failed (%s)!", esp_err_to_name(err));
         task_fatal_error();