09. How To Flash Your Portenta X8

This tutorial teaches you how to flash your Portenta X8 through USB.


In this tutorial, you will learn how to manually flash your Portenta X8 with the image provided by Arduino. You will flash your board through USB using the Terminal. The instructions below are meant to be used with a Windows Operating System.


  • Learn how to get the required files
  • Learn how to set up the correct structure of the files
  • Learn how to set up the board
  • Learn how to flash the device

Required Hardware and Software


Arduino's Download Repository

Go to Arduino Download repository and a compressed

with latest version of all the required OS image files will be there to download.

lpm-manifest repository overview
lpm-manifest repository overview

Please extract the files after you have downloaded the compressed file. The extracted contents have the following structure.

1Unzipped folder
2├── imx-boot-portenta-x8
3├── lmp-partner-arduino-image-portenta-x8.wic.gz **(Compressed)**
4├── mfgtool-files-portenta-x8.tar.gz **(Compressed)**
5├── sit-portenta-x8.bin
6└── u-boot-portenta-x8.itb

After verifying these files are available, you will need to decompress

. Please make sure the
is in the unzipped folder in the main directory. The folder structure should share a similar following layout.

1Unzipped folder
2├── mfgtool-files-portenta-x8/
3├── imx-boot-portenta-x8
4├── lmp-partner-arduino-image-portenta-x8.wic
5├── lmp-partner-arduino-image-portenta-x8.wic.gz **(Compressed)**
6├── mfgtool-files-portenta-x8.tar.gz **(Compressed)**
7├── sit-portenta-x8.bin
8└── u-boot-portenta-x8.itb

Setting the Portenta X8 to Flashing Mode

Flashing Mode with Carrier

Connect your Portenta X8 into your carrier of choice, either Portenta Breakout or Portenta Max Carrier, via High-Density connectors. After connecting the Portenta X8, you will need to set the

DIP switches to the ON position. The
switch configuration is important as it will put the board into Flashing mode.

On the Portenta Max Carrier, the DIP switches are identified by the label

as shown in the figure:

Max Carrier DIP switches
Max Carrier DIP switches

On the Portenta Breakout, the DIP switches are identified by the label

as shown in the figure:

Breakout DIP switches
Breakout DIP switches

You will need to connect one USB-C® end to the Portenta X8 and the other end (USB-C® or USB-A) to your computer. If the connection is established correctly, you will be able to see a newly connected device called

SE Blank M845S

Flashing Mode without Carrier

It is recommended to flash the board with the carrier. If it is not possible, we provide an alternative procedure for advanced users only implying the full flash memory erasing. If something gets wrong during the procedure, you might not be able to recover the board. Proceed with caution.

If Portenta Breakout or Portenta Max Carrier is not available to you, the Portenta X8 can be configured for programming mode using a few lines of command inside the Portenta X8's terminal via ADB. Please use the following commands in exact sequence while you are in the root environment with root permission.

1echo 0 > /sys/block/mmcblk2boot0/force_ro
1dd if=/dev/zero of=/dev/mmcblk2boot0 bs=1024 count=4096 && sync
1echo 0 > /sys/block/mmcblk2boot1/force_ro
1dd if=/dev/zero of=/dev/mmcblk2boot1 bs=1024 count=4096 && sync

This sequence of commands will allow you to reset Portenta X8's bootloader sector, defaulting the internal bootloader to


Flashing the Portenta X8

To flash the Portenta X8, you need to begin by opening a terminal. Within the terminal, you need to change the directory to where

file is located using the
command. Once it is inside the directory where the previous file is included, the following command is used:

1uuu full_image.uuu

If you have followed the Flashing Mode without Carrier method to flash an OS or a custom image, the

command should be active and seeking for the board. While the process is active, please unplug and reconnect the USB-C® cable powering the Portenta X8 to allow entering the programming mode of the boot sequence. This should trigger the standing-by
task to run the flash process.

When the flashing operation is finished, you should see a similar result as the following figure:

uuu tool flashing success output
uuu tool flashing success output

Once you have verified it has successfully flashed the Portenta X8, the

DIP switches that have been configured to the ON position, now need to be set to the OFF position. Otherwise, you will always have the Portenta X8 in Flashing mode whenever it is attached to a carrier. Recycle the power for Portenta X8 by reconnecting the board to your computer and start using with the latest updates.

In case the Portenta X8 was flashed barebone, you will just need to recycle the power and should be ready with the latest OS image.

After booting, you will need to wait 10 seconds until the Portenta X8 starts blinking Blue LED. The Blue LED indicates it was able to boot successfully.


In this tutorial, you have learned to flash the Portenta X8 by getting the latest image, setting up the adequate file structure and the board, and finally flashing the board with these files.


  • If you get an error while it is flashing, make sure your USB is correctly plugged in. Reconnect your board and try to flash it again. You may need to go through a few trials before successful flashing.
  • If you get an error related to permissions, try to launch the
    command as Super User (

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