diff --git a/Rakefile b/Rakefile
index 4b54ec3..12bc006 100644
--- a/Rakefile
+++ b/Rakefile
@@ -19,6 +19,7 @@ BOARD = ENV["BOARD"] || "MINIF401"
 # get MCU from board
 DEVICE = case BOARD
 when "MINIF401"
+  # the genuine MINIF401 with stm32f401cc is discontinued and has been replaced with stm32f401ce (just more RAM/flash), but knockoffs with stm32f401cc are still common
   "stm32f401cc"
 else
   raise "unknown MCU for board #{BOARD}"
diff --git a/lib/flash_internal.c b/lib/flash_internal.c
index 37c9fb9..ff82df3 100644
--- a/lib/flash_internal.c
+++ b/lib/flash_internal.c
@@ -65,12 +65,69 @@ static const struct flash_internal_section_info_s sections_f401xbc[] = {
 	},
 };
 
+/** information about the STM42F401xD/E flash sections */
+static const struct flash_internal_section_info_s sections_f401xde[] = {
+	{
+		.number = 0,
+		.size = 16,
+		.start = FLASH_BASE + (0) * 1024,
+		.end = FLASH_BASE + (16) * 1024 - 1,
+	},
+	{
+		.number = 1,
+		.size = 16,
+		.start = FLASH_BASE + (0 + 16) * 1024,
+		.end = FLASH_BASE + (16 + 16) * 1024 - 1,
+	},
+	{
+		.number = 2,
+		.size = 16,
+		.start = FLASH_BASE + (0 + 16 + 16) * 1024,
+		.end = FLASH_BASE + (16 + 16 + 16) * 1024 - 1,
+	},
+	{
+		.number = 3,
+		.size = 16,
+		.start = FLASH_BASE + (0 + 16 + 16 + 16) * 1024,
+		.end = FLASH_BASE + (16 + 16 + 16 + 16) * 1024 - 1,
+	},
+	{
+		.number = 4,
+		.size = 64,
+		.start = FLASH_BASE + (0 + 16 + 16 + 16 + 16) * 1024,
+		.end = FLASH_BASE + (16 + 16 + 16 + 16 + 64) * 1024 - 1,
+	},
+	{
+		.number = 5,
+		.size = 128,
+		.start = FLASH_BASE + (0 + 16 + 16 + 16 + 16 + 64) * 1024,
+		.end = FLASH_BASE + (16 + 16 + 16 + 16 + 64 + 128) * 1024 - 1,
+	},
+	{
+		.number = 6,
+		.size = 128,
+		.start = FLASH_BASE + (0 + 16 + 16 + 16 + 16 + 64 + 128) * 1024,
+		.end = FLASH_BASE + (16 + 16 + 16 + 16 + 64 + 128 + 128) * 1024 - 1,
+	},
+	{
+		.number = 7,
+		.size = 128,
+		.start = FLASH_BASE + (0 + 16 + 16 + 16 + 16 + 64 + 128 + 128) * 1024,
+		.end = FLASH_BASE + (16 + 16 + 16 + 16 + 64 + 128 + 128 + 128) * 1024 - 1,
+	},
+};
+
 static const struct flash_sections_info_s flash_sections_info[] = {
 	{
 		.device_id = 0x423,
 		.number = LENGTH(sections_f401xbc),
 		.sections = sections_f401xbc,
 	},
+	{
+		.device_id = 0x433,
+		.number = LENGTH(sections_f401xde),
+		.sections = sections_f401xde,
+	},
 };
 
 bool flash_internal_range(uint32_t address, size_t size)