# Portenta X8 completely not detected over USB, uuu flashing not possible **URL:** \ **Category:** Portenta X8\ **Created:** [May 7, 2026, 1:35pm UTC](https://forum.arduino.cc/t/portenta-x8-completely-not-detected-over-usb-uuu-flashing-not-possible/1443064 "2026-05-07T13:35:59Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![jeayonglee](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/jeayonglee/32/1267082_2.png) [@jeayonglee](https://forum.arduino.cc/u/jeayonglee)\ **Post date:** [May 7, 2026, 1:35pm UTC](https://forum.arduino.cc/t/portenta-x8-completely-not-detected-over-usb-uuu-flashing-not-possible/1443064/1 "2026-05-07T13:35:59Z")
Hi everyone, I am using a Portenta X8 with the Portenta Breakout board, and I think my board might be bricked. I was trying to reflash the image using the `uuu` flashing tool on Windows, following the official “How to update your Portenta X8” documentation. This is what I did: - Downloaded `image-latest.tar.gz` from the Arduino download page and extracted it. - Extracted `mfgtool-files-portenta-x8.tar.gz` and `lmp-factory-image-portenta-x8.wic.gz` so that I have the `mfgtool-files-portenta-x8` directory and the `.wic` file in the same folder. - Downloaded `uuu.exe` and put it into the `mfgtool-files-portenta-x8` folder. - On the Portenta Breakout, I set both `BT_SEL` and `BOOT` DIP switches to **ON** (flashing mode). - Connected the Portenta X8 + Breakout to my PC using a USB‑C to USB‑A data cable. - Opened an elevated PowerShell and ran: ```powershell .\uuu .\full_image.uuu ``` - `uuu` starts correctly and prints: ```plaintext uuu (Universal Update Utility) for nxp imx chips -- libuuu_1.5.109-0-g6c3190c Wait for Known USB Device Appear... ``` The problem is that **nothing else ever happens** : - When I unplug and re‑plug the USB cable, there is no new log line in `uuu`. - Windows Device Manager shows **no new device at all** when I plug in the board (no COM port, no unknown device, nothing). - I tried multiple data cables and multiple USB ports. - I also tested on another PC, and it behaves the same (no USB device appears). Board LEDs: - On the Portenta X8, a red LED and a white LED stay on continuously. - On the Ethernet port, the LEDs stay on as well. So the board clearly has power, but it never shows up as a USB device on any computer, and `uuu` keeps waiting forever for a USB device. I also tried removing and reseating the Portenta X8 on the Breakout, double‑checking that `BT_SEL` and `BOOT` are both ON, and power‑cycling the board several times. It still does not get detected. At this point, is there any other recovery method I can try, or does this indicate that the board is permanently bricked and needs to be replaced (RMA)? Any help or official guidance would be greatly appreciated. Thanks in advance. ---
**Author:** ![steve9](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/steve9/32/1098630_2.png) [@steve9](https://forum.arduino.cc/u/steve9)\ **Post date:** [May 7, 2026, 2:07pm UTC](https://forum.arduino.cc/t/portenta-x8-completely-not-detected-over-usb-uuu-flashing-not-possible/1443064/2 "2026-05-07T14:07:50Z")
Hi @jeayonglee , I don't have the X8, so this is a bit of a shot-in-the-dark, but have you tried double-clicking the reset button to put it in bootloader mode? Works on my GIGA (same MCU) when I have a code issue that locks it up. ---
**Author:** ![jeayonglee](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/jeayonglee/32/1267082_2.png) [@jeayonglee](https://forum.arduino.cc/u/jeayonglee)\ **Post date:** [May 7, 2026, 2:43pm UTC](https://forum.arduino.cc/t/portenta-x8-completely-not-detected-over-usb-uuu-flashing-not-possible/1443064/3 "2026-05-07T14:43:27Z")
first thank you for answer, i tried double clicking but didn't solved the problem. same white and red led still on, not changing. ---
**Author:** ![steve9](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/steve9/32/1098630_2.png) [@steve9](https://forum.arduino.cc/u/steve9)\ **Post date:** [May 7, 2026, 2:58pm UTC](https://forum.arduino.cc/t/portenta-x8-completely-not-detected-over-usb-uuu-flashing-not-possible/1443064/4 "2026-05-07T14:58:13Z")
Found this, maybe it will help [Portenta X8 not working after update](https://forum.arduino.cc/t/portenta-x8-not-working-after-update/1164272) ---
**Author:** ![neurogatix8](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/neurogatix8/32/1128416_2.png) [@neurogatix8](https://forum.arduino.cc/u/neurogatix8)\ **Post date:** [May 14, 2026, 4:26pm UTC](https://forum.arduino.cc/t/portenta-x8-completely-not-detected-over-usb-uuu-flashing-not-possible/1443064/5 "2026-05-14T16:26:39Z")
I faced the same issue today. But then it worked for me. I had to restructure the files in the folder properly according to the user manual. Did the Arduino Linux Wizard detect your Portenta X8? I am facing issues in connecting Portenta X8 with the Linux Wizard. Check my other post on this. ---
**Author:** ![jeayonglee](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/jeayonglee/32/1267082_2.png) [@jeayonglee](https://forum.arduino.cc/u/jeayonglee)\ **Post date:** [May 15, 2026, 11:10am UTC](https://forum.arduino.cc/t/portenta-x8-completely-not-detected-over-usb-uuu-flashing-not-possible/1443064/6 "2026-05-15T11:10:16Z")
can i get a link? your profile is locked ---
**Author:** ![jeayonglee](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/jeayonglee/32/1267082_2.png) [@jeayonglee](https://forum.arduino.cc/u/jeayonglee)\ **Post date:** [May 15, 2026, 11:12am UTC](https://forum.arduino.cc/t/portenta-x8-completely-not-detected-over-usb-uuu-flashing-not-possible/1443064/7 "2026-05-15T11:12:26Z")
but my portenta is not detected by linux. ---
**Author:** ![neurogatix8](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/neurogatix8/32/1128416_2.png) [@neurogatix8](https://forum.arduino.cc/u/neurogatix8)\ **Post date:** [May 15, 2026, 11:22am UTC](https://forum.arduino.cc/t/portenta-x8-completely-not-detected-over-usb-uuu-flashing-not-possible/1443064/8 "2026-05-15T11:22:48Z")
> [@Unable to Setup New Portenta X8 with the Arduino Linux Wizard](https://forum.arduino.cc/t/unable-to-setup-new-portenta-x8-with-the-arduino-linux-wizard/1444039): > > Hello all, I have got a new Portenta X8. I was going through its user manual and performing the first getting started, which is "Setup with the Arduino Linux Wizard." I have followed the steps to: navigate to [www.arduino.cc/start](http://www.arduino.cc/start) Create an account and download the Arduino Create Agent. This agent is working fine and running from the system tray. It is the next step that is giving an error. I have connected the Portenta X8 to my PC using a USB-A to USB-C cable. I can see that it is detected … ---
**Author:** ![jeayonglee](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/jeayonglee/32/1267082_2.png) [@jeayonglee](https://forum.arduino.cc/u/jeayonglee)\ **Post date:** [May 15, 2026, 11:36am UTC](https://forum.arduino.cc/t/portenta-x8-completely-not-detected-over-usb-uuu-flashing-not-possible/1443064/9 "2026-05-15T11:36:22Z")
thank you for your response. but my device is not detected on any environment or program. maybe my device became bricked