ESP32-S3 Fatal error during fuse burning

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cornelius
Posts: 2
Joined: Fri May 05, 2023 5:08 pm

ESP32-S3 Fatal error during fuse burning

Postby cornelius » Fri Dec 20, 2024 6:38 am

Hello all. I am designing a PCB which includes ESP32-S3 (directly, not a module like WROOM etc.). It is meant to be connected for power and data transfer to USB port of my PC. Yesterday I received a test board straight from a factory with a clean ESP and wanted to flash some fuses to begin with. What I did step by step:
1. Put the chip in joint download boot mode by holding boot when reseting
2. Chip was properly recognized by my PC as COM
3. Tried reading fuses with espefuse.py. That succeeded as below:

Code: Select all

PS C:\WINDOWS\system32> C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Scripts\python.exe 'C:\Users\[...]\esp\v5.3.1\esp-idf\components\esptool_py\esptool\espefuse.py' summary -p COM5
espefuse.py v4.8.1
Connecting...
Detecting chip type... ESP32-S3

=== Run "summary" command ===
EFUSE_NAME (Block) Description  = [Meaningful Value] [Readable/Writeable] (Hex Value)
----------------------------------------------------------------------------------------
Calibration fuses:
K_RTC_LDO (BLOCK1)                                 BLOCK1 K_RTC_LDO                                   = 4 R/W (0b0000001)
K_DIG_LDO (BLOCK1)                                 BLOCK1 K_DIG_LDO                                   = 0 R/W (0b1000000)
V_RTC_DBIAS20 (BLOCK1)                             BLOCK1 voltage of rtc dbias20                      = 12 R/W (0x03)
V_DIG_DBIAS20 (BLOCK1)                             BLOCK1 voltage of digital dbias20                  = 8 R/W (0x02)
DIG_DBIAS_HVT (BLOCK1)                             BLOCK1 digital dbias when hvt                      = -32 R/W (0b11000)
ADC2_CAL_VOL_ATTEN3 (BLOCK1)                       ADC2 calibration voltage at atten3                 = 112 R/W (0b011100)
TEMP_CALIB (BLOCK2)                                Temperature calibration data                       = -8.0 R/W (0b101010000)
OCODE (BLOCK2)                                     ADC OCode                                          = 74 R/W (0x4a)
ADC1_INIT_CODE_ATTEN0 (BLOCK2)                     ADC1 init code at atten0                           = -12 R/W (0x83)
ADC1_INIT_CODE_ATTEN1 (BLOCK2)                     ADC1 init code at atten1                           = -8 R/W (0b100010)
ADC1_INIT_CODE_ATTEN2 (BLOCK2)                     ADC1 init code at atten2                           = 108 R/W (0b011011)
ADC1_INIT_CODE_ATTEN3 (BLOCK2)                     ADC1 init code at atten3                           = 120 R/W (0b011110)
ADC2_INIT_CODE_ATTEN0 (BLOCK2)                     ADC2 init code at atten0                           = -136 R/W (0xa2)
ADC2_INIT_CODE_ATTEN1 (BLOCK2)                     ADC2 init code at atten1                           = -12 R/W (0b100011)
ADC2_INIT_CODE_ATTEN2 (BLOCK2)                     ADC2 init code at atten2                           = 56 R/W (0b001110)
ADC2_INIT_CODE_ATTEN3 (BLOCK2)                     ADC2 init code at atten3                           = 116 R/W (0b011101)
ADC1_CAL_VOL_ATTEN0 (BLOCK2)                       ADC1 calibration voltage at atten0                 = 436 R/W (0x6d)
ADC1_CAL_VOL_ATTEN1 (BLOCK2)                       ADC1 calibration voltage at atten1                 = 464 R/W (0x74)
ADC1_CAL_VOL_ATTEN2 (BLOCK2)                       ADC1 calibration voltage at atten2                 = 412 R/W (0x67)
ADC1_CAL_VOL_ATTEN3 (BLOCK2)                       ADC1 calibration voltage at atten3                 = 468 R/W (0x75)
ADC2_CAL_VOL_ATTEN0 (BLOCK2)                       ADC2 calibration voltage at atten0                 = 444 R/W (0x6f)
ADC2_CAL_VOL_ATTEN1 (BLOCK2)                       ADC2 calibration voltage at atten1                 = 204 R/W (0b0110011)
ADC2_CAL_VOL_ATTEN2 (BLOCK2)                       ADC2 calibration voltage at atten2                 = 236 R/W (0b0111011)

Config fuses:
WR_DIS (BLOCK0)                                    Disable programming of individual eFuses           = 0 R/W (0x00000000)
RD_DIS (BLOCK0)                                    Disable reading from BlOCK4-10                     = 0 R/W (0b0000000)
DIS_ICACHE (BLOCK0)                                Set this bit to disable Icache                     = False R/W (0b0)
DIS_DCACHE (BLOCK0)                                Set this bit to disable Dcache                     = False R/W (0b0)
DIS_TWAI (BLOCK0)                                  Set this bit to disable CAN function               = False R/W (0b0)
DIS_APP_CPU (BLOCK0)                               Disable app cpu                                    = False R/W (0b0)
DIS_DIRECT_BOOT (BLOCK0)                           Disable direct boot mode                           = False R/W (0b0)
UART_PRINT_CONTROL (BLOCK0)                        Set the default UART boot message output mode      = Enable R/W (0b00)
PIN_POWER_SELECTION (BLOCK0)                       Set default power supply for GPIO33-GPIO37; set wh = VDD3P3_CPU R/W (0b0)
                                                   en SPI flash is initialized
PSRAM_CAP (BLOCK1)                                 PSRAM capacity                                     = 2M R/W (0b10)
PSRAM_TEMP (BLOCK1)                                PSRAM temperature                                  = 105C R/W (0b01)
PSRAM_VENDOR (BLOCK1)                              PSRAM vendor                                       = AP_3v3 R/W (0b01)
BLOCK_USR_DATA (BLOCK3)                            User data
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_SYS_DATA2 (BLOCK10)                          System data part 2 (reserved)
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W

Flash fuses:
FLASH_TPUW (BLOCK0)                                Configures flash waiting time after power-up; in u = 0 R/W (0x0)
                                                   nit of ms. If the value is less than 15; the waiti
                                                   ng time is the configurable value.  Otherwise; the
                                                    waiting time is twice the configurable value
FLASH_ECC_MODE (BLOCK0)                            Flash ECC mode in ROM                              = 16to18 byte R/W (0b0)
FLASH_TYPE (BLOCK0)                                SPI flash type                                     = 4 data lines R/W (0b0)
FLASH_PAGE_SIZE (BLOCK0)                           Set Flash page size                                = 0 R/W (0b00)
FLASH_ECC_EN (BLOCK0)                              Set 1 to enable ECC for flash boot                 = False R/W (0b0)
FORCE_SEND_RESUME (BLOCK0)                         Set this bit to force ROM code to send a resume co = False R/W (0b0)
                                                   mmand during SPI boot
FLASH_CAP (BLOCK1)                                 Flash capacity                                     = 4M R/W (0b010)
FLASH_TEMP (BLOCK1)                                Flash temperature                                  = 105C R/W (0b01)
FLASH_VENDOR (BLOCK1)                              Flash vendor                                       = XMC R/W (0b001)

Identity fuses:
DISABLE_WAFER_VERSION_MAJOR (BLOCK0)               Disables check of wafer version major              = False R/W (0b0)
DISABLE_BLK_VERSION_MAJOR (BLOCK0)                 Disables check of blk version major                = False R/W (0b0)
WAFER_VERSION_MINOR_LO (BLOCK1)                    WAFER_VERSION_MINOR least significant bits         = 2 R/W (0b010)
PKG_VERSION (BLOCK1)                               Package version                                    = 0 R/W (0b000)
BLK_VERSION_MINOR (BLOCK1)                         BLK_VERSION_MINOR                                  = 3 R/W (0b011)
WAFER_VERSION_MINOR_HI (BLOCK1)                    WAFER_VERSION_MINOR most significant bit           = False R/W (0b0)
WAFER_VERSION_MAJOR (BLOCK1)                       WAFER_VERSION_MAJOR                                = 0 R/W (0b00)
OPTIONAL_UNIQUE_ID (BLOCK2)                        Optional unique 128-bit ID
   = df 1e 88 e2 f3 f1 be 25 d1 42 52 08 4b 9c 5f 23 R/W
BLK_VERSION_MAJOR (BLOCK2)                         BLK_VERSION_MAJOR of BLOCK2                        = ADC calib V1 R/W (0b01)
WAFER_VERSION_MINOR (BLOCK0)                       calc WAFER VERSION MINOR = WAFER_VERSION_MINOR_HI  = 2 R/W (0x2)
                                                   << 3 + WAFER_VERSION_MINOR_LO (read only)

Jtag fuses:
SOFT_DIS_JTAG (BLOCK0)                             Set these bits to disable JTAG in the soft way (od = 0 R/W (0b000)
                                                   d number 1 means disable ). JTAG can be enabled in
                                                    HMAC module
DIS_PAD_JTAG (BLOCK0)                              Set this bit to disable JTAG in the hard way. JTAG = False R/W (0b0)
                                                    is disabled permanently
STRAP_JTAG_SEL (BLOCK0)                            Set this bit to enable selection between usb_to_jt = False R/W (0b0)
                                                   ag and pad_to_jtag through strapping gpio10 when b
                                                   oth reg_dis_usb_jtag and reg_dis_pad_jtag are equa
                                                   l to 0

Mac fuses:
MAC (BLOCK1)                                       MAC address
   = 24:ec:4a:2d:15:b8 (OK) R/W
CUSTOM_MAC (BLOCK3)                                Custom MAC
   = 00:00:00:00:00:00 (OK) R/W

Security fuses:
DIS_DOWNLOAD_ICACHE (BLOCK0)                       Set this bit to disable Icache in download mode (b = False R/W (0b0)
                                                   oot_mode[3:0] is 0; 1; 2; 3; 6; 7)
DIS_DOWNLOAD_DCACHE (BLOCK0)                       Set this bit to disable Dcache in download mode (  = False R/W (0b0)
                                                   boot_mode[3:0] is 0; 1; 2; 3; 6; 7)
DIS_FORCE_DOWNLOAD (BLOCK0)                        Set this bit to disable the function that forces c = False R/W (0b0)
                                                   hip into download mode
DIS_DOWNLOAD_MANUAL_ENCRYPT (BLOCK0)               Set this bit to disable flash encryption when in d = False R/W (0b0)
                                                   ownload boot modes
SPI_BOOT_CRYPT_CNT (BLOCK0)                        Enables flash encryption when 1 or 3 bits are set  = Disable R/W (0b000)
                                                   and disabled otherwise
SECURE_BOOT_KEY_REVOKE0 (BLOCK0)                   Revoke 1st secure boot key                         = False R/W (0b0)
SECURE_BOOT_KEY_REVOKE1 (BLOCK0)                   Revoke 2nd secure boot key                         = False R/W (0b0)
SECURE_BOOT_KEY_REVOKE2 (BLOCK0)                   Revoke 3rd secure boot key                         = False R/W (0b0)
KEY_PURPOSE_0 (BLOCK0)                             Purpose of Key0                                    = USER R/W (0x0)
KEY_PURPOSE_1 (BLOCK0)                             Purpose of Key1                                    = USER R/W (0x0)
KEY_PURPOSE_2 (BLOCK0)                             Purpose of Key2                                    = USER R/W (0x0)
KEY_PURPOSE_3 (BLOCK0)                             Purpose of Key3                                    = USER R/W (0x0)
KEY_PURPOSE_4 (BLOCK0)                             Purpose of Key4                                    = USER R/W (0x0)
KEY_PURPOSE_5 (BLOCK0)                             Purpose of Key5                                    = USER R/W (0x0)
SECURE_BOOT_EN (BLOCK0)                            Set this bit to enable secure boot                 = False R/W (0b0)
SECURE_BOOT_AGGRESSIVE_REVOKE (BLOCK0)             Set this bit to enable revoking aggressive secure  = False R/W (0b0)
                                                   boot
DIS_DOWNLOAD_MODE (BLOCK0)                         Set this bit to disable download mode (boot_mode[3 = False R/W (0b0)
                                                   :0] = 0; 1; 2; 3; 6; 7)
ENABLE_SECURITY_DOWNLOAD (BLOCK0)                  Set this bit to enable secure UART download mode   = False R/W (0b0)
SECURE_VERSION (BLOCK0)                            Secure version (used by ESP-IDF anti-rollback feat = 0 R/W (0x0000)
                                                   ure)
BLOCK_KEY0 (BLOCK4)
  Purpose: USER
               Key0 or user data
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_KEY1 (BLOCK5)
  Purpose: USER
               Key1 or user data
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_KEY2 (BLOCK6)
  Purpose: USER
               Key2 or user data
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_KEY3 (BLOCK7)
  Purpose: USER
               Key3 or user data
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_KEY4 (BLOCK8)
  Purpose: USER
               Key4 or user data
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_KEY5 (BLOCK9)
  Purpose: USER
               Key5 or user data
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W

Spi Pad fuses:
SPI_PAD_CONFIG_CLK (BLOCK1)                        SPI_PAD_configure CLK                              = 0 R/W (0b000000)
SPI_PAD_CONFIG_Q (BLOCK1)                          SPI_PAD_configure Q(D1)                            = 0 R/W (0b000000)
SPI_PAD_CONFIG_D (BLOCK1)                          SPI_PAD_configure D(D0)                            = 0 R/W (0b000000)
SPI_PAD_CONFIG_CS (BLOCK1)                         SPI_PAD_configure CS                               = 0 R/W (0b000000)
SPI_PAD_CONFIG_HD (BLOCK1)                         SPI_PAD_configure HD(D3)                           = 0 R/W (0b000000)
SPI_PAD_CONFIG_WP (BLOCK1)                         SPI_PAD_configure WP(D2)                           = 0 R/W (0b000000)
SPI_PAD_CONFIG_DQS (BLOCK1)                        SPI_PAD_configure DQS                              = 0 R/W (0b000000)
SPI_PAD_CONFIG_D4 (BLOCK1)                         SPI_PAD_configure D4                               = 0 R/W (0b000000)
SPI_PAD_CONFIG_D5 (BLOCK1)                         SPI_PAD_configure D5                               = 0 R/W (0b000000)
SPI_PAD_CONFIG_D6 (BLOCK1)                         SPI_PAD_configure D6                               = 0 R/W (0b000000)
SPI_PAD_CONFIG_D7 (BLOCK1)                         SPI_PAD_configure D7                               = 0 R/W (0b000000)

Usb fuses:
DIS_USB_OTG (BLOCK0)                               Set this bit to disable USB function               = False R/W (0b0)
USB_EXCHG_PINS (BLOCK0)                            Set this bit to exchange USB D+ and D- pins        = False R/W (0b0)
USB_EXT_PHY_ENABLE (BLOCK0)                        Set this bit to enable external PHY                = False R/W (0b0)
DIS_USB_JTAG (BLOCK0)                              Set this bit to disable function of usb switch to  = False R/W (0b0)
                                                   jtag in module of usb device
DIS_USB_SERIAL_JTAG (BLOCK0)                       Set this bit to disable usb device                 = False R/W (0b0)
USB_PHY_SEL (BLOCK0)                               This bit is used to switch internal PHY and extern
   = internal PHY is assigned to USB Device while external PHY is assigned to USB OTG R/W (0b0)
                                                   al PHY for USB OTG and USB Device
DIS_USB_SERIAL_JTAG_ROM_PRINT (BLOCK0)             USB printing                                       = Enable R/W (0b0)
DIS_USB_SERIAL_JTAG_DOWNLOAD_MODE (BLOCK0)         Set this bit to disable UART download mode through = False R/W (0b0)
                                                    USB
DIS_USB_OTG_DOWNLOAD_MODE (BLOCK0)                 Set this bit to disable download through USB-OTG   = False R/W (0b0)

Vdd fuses:
VDD_SPI_XPD (BLOCK0)                               SPI regulator power up signal                      = True R/W (0b1)
VDD_SPI_TIEH (BLOCK0)                              If VDD_SPI_FORCE is 1; determines VDD_SPI voltage
   = VDD_SPI connects to VDD3P3_RTC_IO R/W (0b1)
VDD_SPI_FORCE (BLOCK0)                             Set this bit and force to use the configuration of = True R/W (0b1)
                                                    eFuse to configure VDD_SPI

Wdt fuses:
WDT_DELAY_SEL (BLOCK0)                             RTC watchdog timeout threshold; in unit of slow cl = 40000 R/W (0b00)
                                                   ock cycle

Flash voltage (VDD_SPI) set to 3.3V by efuse.
4. Tried buring USB_PHY_SEL efuse to 1 with following result:

Code: Select all

PS C:\WINDOWS\system32> C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Scripts\python.exe 'C:\Users\[...]\esp\v5.3.1\esp-idf\components\esptool_py\esptool\espefuse.py' burn_efuse USB_PHY_SEL 1 -p COM5
espefuse.py v4.8.1
Connecting...
Detecting chip type... ESP32-S3

=== Run "burn_efuse" command ===
The efuses to burn:
  from BLOCK0
     - USB_PHY_SEL

Burning efuses:

    - 'USB_PHY_SEL' (This bit is used to switch internal PHY and external PHY for USB OTG and USB Device) 0b0 -> 0b1


Check all blocks for burn...
idx, BLOCK_NAME,          Conclusion
[00] BLOCK0               is not empty
        (written ): 0x0000000000000000000000000000d1f50000000000000000
        (to write): 0x000000000000000002000000000000000000000000000000
        (coding scheme = NONE)
.
This is an irreversible operation!
Type 'BURN' (all capitals) to continue.
BURN
Traceback (most recent call last):
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\esptool\loader.py", line 479, in command
    p = self.read()
        ^^^^^^^^^^^
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\esptool\loader.py", line 412, in read
    return next(self._slip_reader)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\esptool\loader.py", line 1628, in slip_reader
    raise FatalError(msg)
esptool.util.FatalError: Serial data stream stopped: Possible serial noise or corruption.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\__main__.py", line 8, in <module>
    espefuse._main()
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\__init__.py", line 360, in _main
    main()
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\__init__.py", line 330, in main
    operation_func(esp, efuses, args)
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\efuse\base_operations.py", line 532, in burn_efuse
    if not efuses.burn_all(check_batch_mode=True):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\efuse\base_fields.py", line 612, in burn_all
    burn_block(block, postponed_efuses)
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\efuse\base_fields.py", line 586, in burn_block
    block.burn()
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\efuse\base_fields.py", line 412, in burn
    self.burn_words(words)
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\efuse\base_fields.py", line 378, in burn_words
    self.parent.write_efuses(self.id)
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\efuse\esp32s3\fields.py", line 158, in write_efuses
    self.efuse_program(block)
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\efuse\esp32s3\fields.py", line 188, in efuse_program
    self.efuse_read()
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\efuse\esp32s3\fields.py", line 197, in efuse_read
    self.write_reg(
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\espefuse\efuse\base_fields.py", line 479, in write_reg
    return self._esp.write_reg(addr, value, mask, delay_us, delay_after_us)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\esptool\loader.py", line 822, in write_reg
    return self.check_command("write target memory", self.ESP_WRITE_REG, command)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\esptool\loader.py", line 510, in check_command
    val, data = self.command(op, data, chk, timeout=timeout)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\esptool\loader.py", line 497, in command
    self._port.timeout = saved_timeout
    ^^^^^^^^^^^^^^^^^^
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\serial\serialutil.py", line 372, in timeout
    self._reconfigure_port()
  File "C:\Users\[...]\.espressif\python_env\idf5.3_py3.11_env\Lib\site-packages\serial\serialwin32.py", line 222, in _reconfigure_port
    raise SerialException(
serial.serialutil.SerialException: Cannot configure port, something went wrong. Original message: PermissionError(13, 'Urządzenie dołączone do komputera nie działa.', None, 31)
After that error board stopped responding. After reset and/or re-connecting it to PC board is no longer recognized and no COM port appears. Do you know what might have happened here? Did I just brick the board somehow, since fuse burn got interrupted? Will I be able to recover from this by flashing through SPI instead of USB? Maybe some wrongly connected strapping pins during startup could have interfered?

Thanks in advance for all help!
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bram128
Posts: 19
Joined: Fri Dec 20, 2024 3:41 am

Re: ESP32-S3 Fatal error during fuse burning

Postby bram128 » Thu Apr 17, 2025 6:37 pm

I am encountering a similar problem when attempting write DIS_DOWNLOAD_MODE. Would love to hear if you or anyone resolved this issue. For reference I am using the USB serial port for communication
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