diff --git a/targets/targets.json b/targets/targets.json
index e0acaffc03..2ba15bc75f 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -6428,189 +6428,6 @@
             "MPU"
         ]
     },
-    "MCU_M2351": {
-        "default_toolchain": "ARMC6",
-        "public": false,
-        "extra_labels": [
-            "NUVOTON",
-            "M2351",
-            "FLASH_CMSIS_ALGO"
-        ],
-        "OUTPUT_EXT": "hex",
-        "macros": [
-            "MBED_FAULT_HANDLER_DISABLED",
-            "LPTICKER_DELAY_TICKS=4"
-        ],
-        "is_disk_virtual": true,
-        "config": {
-            "usb-uart": {
-                "help": "Configure USB_UART. USB_UART and USB_UART_TX/USB_UART_RX must be consistent.",
-                "value": null
-            },
-            "usb-uart-tx": {
-                "help": "Configure USBTX. USB_UART and USBTX/USBRX must be consistent.",
-                "value": null
-            },
-            "usb-uart-rx": {
-                "help": "Configure USBRX. USB_UART and USBTX/USBRX must be consistent.",
-                "value": null
-            },
-            "stdio-uart": {
-                "help": "Configure STDIO_UART. STDIO_UART and STDIO_UART_TX/STDIO_UART_RX must be consistent. STDIO_UART defaults to USB_UART.",
-                "value": null
-            },
-            "stdio-uart-tx": {
-                "help": "Configure STDIO_UART_TX. STDIO_UART and STDIO_UART_TX/STDIO_UART_RX must be consistent. STDIO_UART_TX defaults to USBTX.",
-                "value": null
-            },
-            "stdio-uart-rx": {
-                "help": "Configure STDIO_UART_RX. STDIO_UART and STDIO_UART_TX/STDIO_UART_RX must be consistent. STDIO_UART_RX defaults to USBRX.",
-                "value": null
-            },
-            "gpio-irq-debounce-enable": {
-                "help": "Enable GPIO IRQ debounce",
-                "value": 0
-            },
-            "gpio-irq-debounce-enable-list": {
-                "help": "Comma separated pin list to enable GPIO IRQ debounce",
-                "value": "NC"
-            },
-            "gpio-irq-debounce-clock-source": {
-                "help": "Select GPIO IRQ debounce clock source: GPIO_DBCTL_DBCLKSRC_HCLK or GPIO_DBCTL_DBCLKSRC_LIRC",
-                "value": "GPIO_DBCTL_DBCLKSRC_LIRC"
-            },
-            "gpio-irq-debounce-sample-rate": {
-                "help": "Select GPIO IRQ debounce sample rate: GPIO_DBCTL_DBCLKSEL_1, GPIO_DBCTL_DBCLKSEL_2, GPIO_DBCTL_DBCLKSEL_4, ..., or GPIO_DBCTL_DBCLKSEL_32768",
-                "value": "GPIO_DBCTL_DBCLKSEL_16"
-            }
-        },
-        "overrides": {
-            "deep-sleep-latency": 1,
-            "tickless-from-us-ticker": true,
-            "mpu-rom-end": "0x1fffffff"
-        },
-        "inherits": [
-            "Target"
-        ],
-        "device_has": [
-            "USTICKER",
-            "LPTICKER",
-            "RTC",
-            "ANALOGIN",
-            "ANALOGOUT",
-            "I2C",
-            "I2CSLAVE",
-            "I2C_ASYNCH",
-            "INTERRUPTIN",
-            "PORTIN",
-            "PORTINOUT",
-            "PORTOUT",
-            "PWMOUT",
-            "SERIAL",
-            "SERIAL_ASYNCH",
-            "SERIAL_FC",
-            "STDIO_MESSAGES",
-            "SLEEP",
-            "SPI",
-            "SPISLAVE",
-            "SPI_ASYNCH",
-            "TRNG",
-            "FLASH",
-            "MPU",
-            "USBDEVICE"
-        ],
-        "release_versions": [
-            "5"
-        ],
-        "sectors": [
-            [
-                0,
-                2048
-            ]
-        ],
-        "bootloader_supported": true,
-        "forced_reset_timeout": 3
-    },
-    "NU_PFM_M2351": {
-        "inherits": [
-            "MCU_M2351"
-        ],
-        "detect_code": [
-            "1305"
-        ],
-        "device_name": "M2351KIAAEES",
-        "public": false,
-        "overrides": {
-            "usb-uart": "UART_0",
-            "usb-uart-tx": "PB_13",
-            "usb-uart-rx": "PB_12"
-        }
-    },
-    "NU_PFM_M2351_NPSA_NS": {
-        "inherits": [
-            "NU_PFM_M2351"
-        ],
-        "core": "Cortex-M23-NS",
-        "trustzone": true,
-        "supported_toolchains": [
-            "ARMC6",
-            "GCC_ARM",
-            "IAR"
-        ],
-        "extra_labels_add": [
-            "M23_NS",
-            "NU_PREBUILD_SECURE"
-        ],
-        "macros_add": [
-            "MBED_TZ_DEFAULT_ACCESS=1"
-        ],
-        "components_add": [
-            "FLASHIAP"
-        ],
-        "post_binary_hook": {
-            "function": "M2351Code.merge_secure"
-        },
-        "secure_image_filename": "NuMaker-mbed-TZ-secure-example.hex",
-        "mbed_rom_start": "0x10010000",
-        "mbed_rom_size": "0x70000",
-        "mbed_ram_start": "0x30002000",
-        "mbed_ram_size": "0x16000",
-        "detect_code": [
-            "1305"
-        ]
-    },
-    "NU_PFM_M2351_NPSA_S": {
-        "overrides": {
-            "boot-stack-size": "0x600"
-        },
-        "inherits": [
-            "NU_PFM_M2351"
-        ],
-        "core": "Cortex-M23",
-        "trustzone": true,
-        "supported_toolchains": [
-            "ARMC6"
-        ],
-        "extra_labels_add": [
-            "M23_S"
-        ],
-        "device_has_remove": [
-            "SERIAL",
-            "SERIAL_ASYNCH",
-            "SERIAL_FC",
-            "STDIO_MESSAGES",
-            "LPTICKER"
-        ],
-        "components_add": [
-            "FLASHIAP"
-        ],
-        "deliver_to_target": "NU_PFM_M2351_NPSA_NS",
-        "delivery_dir": "TARGET_NUVOTON/TARGET_M2351/TARGET_M23_NS/TARGET_NU_PFM_M2351_NPSA_NS/TARGET_NU_PREBUILD_SECURE",
-        "mbed_rom_start": "0x0",
-        "mbed_rom_size": "0x10000",
-        "mbed_ram_start": "0x20000000",
-        "mbed_ram_size": "0x2000"
-    },
     "NUMAKER_M252KG": {
         "core": "Cortex-M23",
         "trustzone": false,