diff --git a/mongoose.c b/mongoose.c
index 33a5231e8b..76aad60076 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -5644,8 +5644,8 @@ MG_IRAM static bool flash_page_start(volatile uint32_t *dst) {
 // Note: the get_config function below works both for RT1020 and 1060
 #if MG_OTA == MG_OTA_RT1020
 MG_IRAM static int flexspi_nor_get_config(
-    struct mg_flexspi_nor_config *config) {
-  struct mg_flexspi_nor_config default_config = {
+  struct mg_flexspi_nor_config *config) {
+  static struct mg_flexspi_nor_config default_config = {
       .memConfig = {.tag = MG_FLEXSPI_CFG_BLK_TAG,
                     .version = MG_FLEXSPI_CFG_BLK_VERSION,
                     .readSampleClkSrc = 1,  // ReadSampleClk_LoopbackFromDqsPad
@@ -5662,8 +5662,11 @@ MG_IRAM static int flexspi_nor_get_config(
       .ipcmdSerialClkFreq = 1,
       .blockSize = 64 * 1024,
       .isUniformBlockSize = false};
-
-  *config = default_config;
+  const uint8_t *src = (const uint8_t *)&default_config;
+  volatile uint8_t *dst = (uint8_t *)config;
+  for (volatile size_t i = 0; i < sizeof(struct mg_flexspi_nor_config); i++) {
+      dst[i] = src[i];
+  }
   return 0;
 }
 #else
@@ -5684,6 +5687,15 @@ MG_IRAM static int flexspi_nor_get_config(
 }
 #endif
 
+MG_IRAM static void mg_spin(volatile uint32_t count) {
+  while (count--) (void) 0;
+}
+
+MG_IRAM static void flash_wait(void) {
+  while ((*((volatile uint32_t *) (0x402A8000 + 0xE0)) & MG_BIT(1)) == 0)
+    mg_spin(1);
+}
+
 MG_IRAM static bool flash_erase(struct mg_flexspi_nor_config *config,
                                 void *addr) {
   if (flash_page_start(addr) == false) {
@@ -5708,7 +5720,7 @@ MG_IRAM static bool mg_imxrt_erase(void *addr) {
   MG_ARM_DISABLE_IRQ();
   ret = (flexspi_nor_get_config(&config) == 0);
   if (ret) ret = flash_erase(&config, addr);
-  MG_ARM_ENABLE_IRQ();
+  if (!s_flash_irq_disabled) MG_ARM_ENABLE_IRQ();
   return ret;
 }
 #endif
@@ -5717,15 +5729,6 @@ MG_IRAM bool mg_imxrt_swap(void) {
   return true;
 }
 
-static inline void spin(volatile uint32_t count) {
-  while (count--) (void) 0;
-}
-
-static inline void flash_wait(void) {
-  while ((*((volatile uint32_t *) (0x402A8000 + 0xE0)) & MG_BIT(1)) == 0)
-    spin(1);
-}
-
 MG_IRAM static bool mg_imxrt_write(void *addr, const void *buf, size_t len) {
   struct mg_flexspi_nor_config config;
   bool ok = false;
diff --git a/src/ota_imxrt.c b/src/ota_imxrt.c
index fc6fdbbdb4..7caaf22d8b 100644
--- a/src/ota_imxrt.c
+++ b/src/ota_imxrt.c
@@ -194,8 +194,8 @@ MG_IRAM static bool flash_page_start(volatile uint32_t *dst) {
 // Note: the get_config function below works both for RT1020 and 1060
 #if MG_OTA == MG_OTA_RT1020
 MG_IRAM static int flexspi_nor_get_config(
-    struct mg_flexspi_nor_config *config) {
-  struct mg_flexspi_nor_config default_config = {
+  struct mg_flexspi_nor_config *config) {
+  static struct mg_flexspi_nor_config default_config = {
       .memConfig = {.tag = MG_FLEXSPI_CFG_BLK_TAG,
                     .version = MG_FLEXSPI_CFG_BLK_VERSION,
                     .readSampleClkSrc = 1,  // ReadSampleClk_LoopbackFromDqsPad
@@ -212,8 +212,11 @@ MG_IRAM static int flexspi_nor_get_config(
       .ipcmdSerialClkFreq = 1,
       .blockSize = 64 * 1024,
       .isUniformBlockSize = false};
-
-  *config = default_config;
+  const uint8_t *src = (const uint8_t *)&default_config;
+  volatile uint8_t *dst = (uint8_t *)config;
+  for (volatile size_t i = 0; i < sizeof(struct mg_flexspi_nor_config); i++) {
+      dst[i] = src[i];
+  }
   return 0;
 }
 #else
@@ -234,6 +237,15 @@ MG_IRAM static int flexspi_nor_get_config(
 }
 #endif
 
+MG_IRAM static void mg_spin(volatile uint32_t count) {
+  while (count--) (void) 0;
+}
+
+MG_IRAM static void flash_wait(void) {
+  while ((*((volatile uint32_t *) (0x402A8000 + 0xE0)) & MG_BIT(1)) == 0)
+    mg_spin(1);
+}
+
 MG_IRAM static bool flash_erase(struct mg_flexspi_nor_config *config,
                                 void *addr) {
   if (flash_page_start(addr) == false) {
@@ -258,7 +270,7 @@ MG_IRAM static bool mg_imxrt_erase(void *addr) {
   MG_ARM_DISABLE_IRQ();
   ret = (flexspi_nor_get_config(&config) == 0);
   if (ret) ret = flash_erase(&config, addr);
-  MG_ARM_ENABLE_IRQ();
+  if (!s_flash_irq_disabled) MG_ARM_ENABLE_IRQ();
   return ret;
 }
 #endif
@@ -267,15 +279,6 @@ MG_IRAM bool mg_imxrt_swap(void) {
   return true;
 }
 
-static inline void spin(volatile uint32_t count) {
-  while (count--) (void) 0;
-}
-
-static inline void flash_wait(void) {
-  while ((*((volatile uint32_t *) (0x402A8000 + 0xE0)) & MG_BIT(1)) == 0)
-    spin(1);
-}
-
 MG_IRAM static bool mg_imxrt_write(void *addr, const void *buf, size_t len) {
   struct mg_flexspi_nor_config config;
   bool ok = false;