Unable to upload sketch on Arduino Uno Q

mitov · February 21, 2026, 7:13pm

Hello folks,
My Arduino Q seems stuck.
When I try to upload even empty sketch I get this:

Starting app "Test1"
Sketch profile configured: Name="default", Port=""
Sketch uses 241 bytes (0%) of program storage space. Maximum is 1966080 bytes.
Global variables use 0 bytes (0%) of dynamic memory, leaving 523624 bytes for local variables. Maximum is 523624 bytes.
Open On-Chip Debugger 0.12.0+dev-ge6a2c12f4 (2025-05-22-15:51)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
debug_level: 2
clock_config
/tmp/remoteocd/sketch.elf-zsk.bin
Info : Linux GPIOD JTAG/SWD bitbang driver (libgpiod v2)
Info : Note: The adapter "linuxgpiod" doesn't support configurable speed
Info : SWD DPIDR 0x0be12477
Info : [stm32u5.ap0] Examination succeed
Info : [stm32u5.cpu] Cortex-M33 r0p4 processor detected
Info : [stm32u5.cpu] target has 8 breakpoints, 4 watchpoints
Info : [stm32u5.cpu] Examination succeed
Info : [stm32u5.ap0] gdb port disabled
Info : [stm32u5.cpu] starting gdb server on 3333
Info : Listening on port 3333 for gdb connections
CPU in Non-Secure state
[stm32u5.cpu] halted due to debug-request, current mode: Handler BusFault
xPSR: 0x09000005 pc: 0x0801b846 msp: 0x2002caf0
Info : SWD DPIDR 0x0be12477
Error: error running OpenOCD: exit status 1
Error: Failed to write memory at 0x00000000
00000000
Open On-Chip Debugger 0.12.0+dev-ge6a2c12f4 (2025-05-22-15:51)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
debug_level: 2
clock_config
/tmp/remoteocd/sketch.elf-zsk.bin
Info : Linux GPIOD JTAG/SWD bitbang driver (libgpiod v2)
Info : Note: The adapter "linuxgpiod" doesn't support configurable speed
Info : SWD DPIDR 0x0be12477
Info : [stm32u5.ap0] Examination succeed
Info : [stm32u5.cpu] Cortex-M33 r0p4 processor detected
Info : [stm32u5.cpu] target has 8 breakpoints, 4 watchpoints
Info : [stm32u5.cpu] Examination succeed
Info : [stm32u5.ap0] gdb port disabled
Info : [stm32u5.cpu] starting gdb server on 3333
Info : Listening on port 3333 for gdb connections
CPU in Non-Secure state
[stm32u5.cpu] halted due to debug-request, current mode: Handler BusFault
xPSR: 0x09000005 pc: 0x0801b846 msp: 0x2002caf0
Info : device idcode = 0x30076482 (STM32U57/U58xx - Rev U : 0x3007)
Info : TZEN = 0 : TrustZone disabled by option bytes
Info : RDP level 0 (0xAA)
Error: error running OpenOCD: exit status 1
Info : flash size = 2048 KiB
Info : flash mode : dual-bank
Info : Padding image section 0 at 0x080f0032 with 14 bytes (bank write end alignment)
Warn : Adding extra erase range, 0x080f0040 .. 0x080f1fff
Error: failed erasing sectors 120 to 120
auto erase enabled
Failed uploading: uploading error: exit status 1

I did a complete reflashing with the following command:

arduino-flasher-cli flash latest

And installed the updates after that, however I still am unable to upload Arduino sketches from the App Lab, including empty new sketch.
The Arduino core seems stuck. There is also no animation when I power the board.
Any suggestions?

Cheers,
Boian

mitov · February 21, 2026, 11:17pm

I also tried this in the terminal:

arduino-cli burn-bootloader -b arduino:zephyr:unoq -P jlink

Getting this:

Open On-Chip Debugger 0.12.0+dev-ge6a2c12f4 (2025-05-22-15:51)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
debug_level: 2
clock_config
/tmp/remoteocd/sketch.elf-zsk.bin
Info : Linux GPIOD JTAG/SWD bitbang driver (libgpiod v2)
Info : Note: The adapter "linuxgpiod" doesn't support configurable speed
Info : SWD DPIDR 0x0be12477
Info : [stm32u5.ap0] Examination succeed
Info : [stm32u5.cpu] Cortex-M33 r0p4 processor detected
Info : [stm32u5.cpu] target has 8 breakpoints, 4 watchpoints
Info : [stm32u5.cpu] Examination succeed
Info : [stm32u5.ap0] gdb port disabled
Info : [stm32u5.cpu] starting gdb server on 3333
Info : Listening on port 3333 for gdb connections
CPU in Non-Secure state
[stm32u5.cpu] halted due to debug-request, current mode: Handler BusFault
xPSR: 0x09000005 pc: 0x0801b846 msp: 0x2002caf0
Error: error running OpenOCD: exit status 1
Info : device idcode = 0x30076482 (STM32U57/U58xx - Rev U : 0x3007)
Info : TZEN = 0 : TrustZone disabled by option bytes
Info : RDP level 0 (0xAA)
Info : flash size = 2048 KiB
Info : flash mode : dual-bank
Info : Padding image section 2 at 0x08031a1c with 4 bytes (bank write end alignment)
Warn : Adding extra erase range, 0x08031a20 .. 0x08031fff
Error: failed erasing sectors 0 to 24
auto erase enabled
Error during Upload: Failed to burn bootloader: uploading error: exit status 1

GolamMostafa · February 21, 2026, 11:47pm

Follow systematic steps:

1. Use IDE 2.3.7.
2. Include Arduino UNO Q in the IDE as board.
3. Upload the following sketch to see that LED3_R (bottom right: STM 3) blinks and Hello message appears on Monitor Console.

#include <Arduino_RouterBridge.h>

void setup() {
  Bridge.begin();
  Monitor.begin();
  delay(5000);

  pinMode(LED_BUILTIN, OUTPUT);
  }

void loop() {

  Monitor.println("Hello");
  digitalWrite(LED_BUILTIN, LOW);   // active LOW; turn LED on
  delay(1000);                      //1000 ms
  digitalWrite(LED_BUILTIN, HIGH);  // active low,LED off
  delay(1000);                      // wait for a second
}

4. To see the difference between Monitor Console and the traditional Serial Monitor and the uploading mechanism, you may look into the following diagrams which I have created for my own understanding.

Figure-1:

Figure-2:

mitov · February 22, 2026, 3:17am

Use IDE 2.3.7.
Include Arduino UNO Q in the IDE as board.

…

When I try to upload I get this error:

Sketch uses 20800 bytes (1%) of program storage space. Maximum is 1966080 bytes.
Global variables use 4756 bytes (0%) of dynamic memory, leaving 518868 bytes for local variables. Maximum is 523624 bytes.
Open On-Chip Debugger 0.12.0+dev-ge6a2c12f4 (2025-05-22-15:51)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
debug_level: 2
clock_config
/tmp/remoteocd/sketch.elf-zsk.bin
Info : Linux GPIOD JTAG/SWD bitbang driver (libgpiod v2)
Info : Note: The adapter "linuxgpiod" doesn't support configurable speed
Info : SWD DPIDR 0x0be12477
Info : [stm32u5.ap0] Examination succeed
Info : [stm32u5.cpu] Cortex-M33 r0p4 processor detected
Info : [stm32u5.cpu] target has 8 breakpoints, 4 watchpoints
Info : [stm32u5.cpu] Examination succeed
Info : [stm32u5.ap0] gdb port disabled
Info : [stm32u5.cpu] starting gdb server on 3333
Info : Listening on port 3333 for gdb connections
CPU in Non-Secure state
[stm32u5.cpu] halted due to debug-request, current mode: Handler BusFault
xPSR: 0x09000005 pc: 0x0801b846 msp: 0x2002caf0
Error: error running OpenOCD: exit status 1
Info : device idcode = 0x30076482 (STM32U57/U58xx - Rev U : 0x3007)
Info : TZEN = 0 : TrustZone disabled by option bytes
Info : RDP level 0 (0xAA)
Info : flash size = 2048 KiB
Info : flash mode : dual-bank
Info : Padding image section 0 at 0x080fd45c with 4 bytes (bank write end alignment)
Warn : Adding extra erase range, 0x080fd460 .. 0x080fdfff
Error: failed erasing sectors 120 to 126
auto erase enabled
Failed uploading: uploading error: exit status 1

mitov · February 22, 2026, 3:21am

GolamMostafa · February 22, 2026, 3:48am

Now, @ptillisch may come up with ideas for next actions.

GolamMostafa · February 22, 2026, 5:19am

@mitov

It looks like that the preinstalled operating system (Linux) and other support services have gone corrupted in your UNO Q.

In thhe meantime, you may try Step-12 of this link. You may be lucky if it works.

mitov · February 22, 2026, 5:31am

Nothing can be uploaded.

I have reflashed the Linux image as described here:

https://docs.arduino.cc/tutorials/uno-q/update-image/

This did not help.

The Linux side is functioning perfectly fine, but I am unable to upload any sketch on the Arduino/TM32U585 side.

I have used the board for a while, and I have uploaded number of sketches, and I have used the external serial, so I am familiar with it. The problem is that it suddenly stopped accepting new sketches to be uloaded.

GolamMostafa · February 22, 2026, 5:50am

Re-check functioning of the Linux MPU by uploading the sketch of Step-5(2) of the link given in post #7.

mitov · February 22, 2026, 5:52am

How to upload?

Every single upload fails. Even empty sketch.

I can’t upload no matter what sketch.

mitov · February 22, 2026, 6:02am

I can turn LED on from Linux with:
echo 1 | tee /sys/class/leds/red:user/brightness # set HIGH/ON
So the Linux core is perfectly fine. It is the Arduino one that is stuck and can’t get into boot mode.

GolamMostafa · February 22, 2026, 7:51am

But, as I understand, during upload process, sketch goes to MPU (Fig-1, 2 of #3) and then to Flash/RAM of MCU/STM. So, you can't say that the MCU is bad. It looks like the problem is with uploading!

When you connect UNO Q with PC, do you hear a dong sound and then a COM port is assigned. For me it is: COM7.

Did you see the Successful message during image updating/reinstalling process?

mitov · February 22, 2026, 4:42pm

The Reinstall went well.

I see com port on the PC when the Linux boots.

mitov · February 22, 2026, 4:44pm

As I said I have tried uploading both from the PC (Arduino IDE, and Visuino), as well as from the App Lab Linux Shell, including calling the Arduino-CLI on the shell to flash a new bootloader with the hope to recover it.

marcinjn · February 22, 2026, 9:47pm

Same for me.

First, my device was disconnecting from usb / wasn't listed in adb devices. Then I flashed OS (to newest Debian). Then my STM sketch Arduino_LED_Matrix/Basic started, but ttyACM0 device started disconnecting. Then I tried to flash sketch once again, and the process stuck on:

xPSR: 0x09000005 pc: 0x0801b846 msp: 0x2002caf0
Error: error running OpenOCD: exit status 1
Info : device idcode = 0x30076482 (STM32U57/U58xx - Rev U : 0x3007)
Info : TZEN = 0 : TrustZone disabled by option bytes
Info : RDP level 0 (0xAA)
Info : flash size = 2048 KiB
Info : flash mode : dual-bank
Info : Padding image section 0 at 0x080f7aac with 4 bytes (bank write end alignment)
Warn : Adding extra erase range, 0x080f7ab0 .. 0x080f7fff
Error: failed erasing sectors 120 to 123
auto erase enabled
Failed uploading: uploading error: exit status 1

I cannot burn bootloader:

arduino@uno-q:/$ arduino-cli burn-bootloader --fqbn arduino:zephyr:unoq --programmer jlink
Open On-Chip Debugger 0.12.0+dev-ge6a2c12f4 (2025-05-22-15:51)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
debug_level: 2
clock_config
/tmp/remoteocd/sketch.elf-zsk.bin
Info : Linux GPIOD JTAG/SWD bitbang driver (libgpiod v2)
Info : Note: The adapter "linuxgpiod" doesn't support configurable speed
Info : SWD DPIDR 0x0be12477
Info : [stm32u5.ap0] Examination succeed
Info : [stm32u5.cpu] Cortex-M33 r0p4 processor detected
Info : [stm32u5.cpu] target has 8 breakpoints, 4 watchpoints
Info : [stm32u5.cpu] Examination succeed
Info : [stm32u5.ap0] gdb port disabled
Info : [stm32u5.cpu] starting gdb server on 3333
Info : Listening on port 3333 for gdb connections
CPU in Non-Secure state
[stm32u5.cpu] halted due to debug-request, current mode: Handler BusFault
xPSR: 0x09000005 pc: 0x0801b846 msp: 0x2002caf0
Error: error running OpenOCD: exit status 1
Info : device idcode = 0x30076482 (STM32U57/U58xx - Rev U : 0x3007)
Info : TZEN = 0 : TrustZone disabled by option bytes
Info : RDP level 0 (0xAA)
Info : flash size = 2048 KiB
Info : flash mode : dual-bank
Warn : Adding extra erase range, 0x08039740 .. 0x08039fff
Error: failed erasing sectors 0 to 28
auto erase enabled
Error during Upload: Failed to burn bootloader: uploading error: exit status 1

marcinjn · February 22, 2026, 11:29pm

After that, the LED matrix no longer displays anything. There is no more animation during startup. Nothing.

mitov · February 22, 2026, 11:33pm

After that, the LED matrix no longer displays anything. There is no more animation during startup. Nothing.

Same here :-(

marcinjn · February 22, 2026, 11:59pm

It seems the Uno Q could break within an hour or two of following the official instructions. I'm disappointed.

mitov · February 23, 2026, 1:00am

My one lasted a bit longer, but I was lucky I guess…

marcinjn · February 23, 2026, 12:51pm

Good news. I've got STM32 working again.

flashing the OS

First, flashed the linux OS (skip, if done already):

arduino-flasher-cli flash ./arduino-unoq-debian-image-20251229-457.tar.zst

or

arduino-flasher-cli flash latest

Then power off and power up the board.

burning the bootloader

Second, connect Arduino Q Uno and run adb shell.
Then run sudo systemctl start arduino-burn-bootloader.service.
Check journalctl if the service succeed, you should see something like that:

Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : SWD DPIDR 0x0be12477
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : [stm32u5.ap0] Examination succeed
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : [stm32u5.cpu] Cortex-M33 r0p4 processor detected
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : [stm32u5.cpu] target has 8 breakpoints, 4 watchpoints
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : [stm32u5.cpu] Examination succeed
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : [stm32u5.ap0] gdb port disabled
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : [stm32u5.cpu] starting gdb server on 3333
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : Listening on port 3333 for gdb connections
Feb 23 12:41:43 uno-q arduino-cli[1495]: Error: [stm32u5.cpu] clearing lockup after double fault
Feb 23 12:41:43 uno-q arduino-cli[1495]: CPU in Non-Secure state
Feb 23 12:41:43 uno-q arduino-cli[1495]: [stm32u5.cpu] halted due to debug-request, current mode: Handler HardFault
Feb 23 12:41:43 uno-q arduino-cli[1495]: xPSR: 0xf9000003 pc: 0xeffffffe msp: 0xffffffd8
Feb 23 12:41:43 uno-q arduino-cli[1495]: Error: [stm32u5.cpu] Polling failed, trying to reexamine
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : [stm32u5.cpu] Cortex-M33 r0p4 processor detected
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : [stm32u5.cpu] target has 8 breakpoints, 4 watchpoints
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : [stm32u5.cpu] Examination succeed
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : device idcode = 0x30076482 (STM32U57/U58xx - Rev U : 0x3007)
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : TZEN = 0 : TrustZone disabled by option bytes
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : RDP level 0 (0xAA)
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : flash size = 2048 KiB
Feb 23 12:41:43 uno-q arduino-cli[1495]: Info : flash mode : dual-bank
Feb 23 12:41:43 uno-q arduino-cli[1495]: Warn : Adding extra erase range, 0x08039740 .. 0x08039fff
Feb 23 12:42:00 uno-q arduino-cli[1495]: shutdown command invoked
Feb 23 12:42:01 uno-q systemd[1]: Finished arduino-burn-bootloader.service - Burn arduino zephyr bootloader on first boot.
░░ Subject: A start job for unit arduino-burn-bootloader.service has finished successfully
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░ 
░░ A start job for unit arduino-burn-bootloader.service has finished successfully.
░░ 
░░ The job identifier is 4262.

does not work?

If that doesn't work, you'll probably need to erase the STM32 first. I did that too, but I can't say if it's mandatory.

Also GPT wrote that /opt/openocd/openocd_gpiod.cfg could have wrong config, because there are srst and trst both bound to gpio 38:

root@uno-q:/# cat /opt/openocd/openocd_gpiod.cfg
adapter driver linuxgpiod

adapter gpio srst 38 -chip 1
adapter gpio swclk 26 -chip 1
adapter gpio swdio 25 -chip 1
adapter gpio trst 38 -chip 1

transport select swd
source [find stm32u5x.cfg]

I've copied the config, removed adapter gpio trst 38 -chip 1 line from /tmp/openocd_gpiod.cfg (a copy), and erased STM32 by using modified config:

/opt/openocd/bin/openocd -s /opt/openocd -s /opt/openocd/share/openocd/scripts -f /tmp/openocd_gpiod_notrst.cfg -c "init; reset halt; flash erase_address 0x08000000 0x200000; reset; exit"

Then I've burned the bootloader.

But as I said - I'm not sure if erasing is necessary.

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Unable to upload sketch on Arduino Uno Q

flashing the OS

burning the bootloader

does not work?

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