Thanks for the information. I see you created a dedicated topic about the problem:
We can use that topic for all further discussion of the problem since it is distinct from the Uno R4 WiFi upload problem that was the primary subject of this topic.
Not working with My r4 wifi, tried installing new IDE , Board is broked , I can see last uploaded code data through Serial port , but unable to install new code
It will not be possible for us to help you with that problem based on such a vague description. Please provide a detailed explanation of what you mean by this, including:
- What did you do?
- What were the results you expected from doing that thing?
- What were the results you observed that did not match your expectations?
Make sure to include the full and exact text of any error or warning message you might have encountered.
1 Like
I'm also having a very similar issue to this. For some reason, both of the Uno R4 WiFi boards I have reported or added their ports as both a USB Serial Device (COM#) and a Standard Serial over Bluetooth link (COM#), where they're both using the same COM number. I don't know if it's safe/wise to remove the Bluetooth links, or if those are somehow necessary to use the Bluetooth part of the WiFi module. I also found that renaming the COM of the Bluetooth link (which stays when the R4 is unplugged?) to a different COM number lets me upload to the board.
Believe I fixed my issue:
I uninstalled the COM3 bluetooth driver while both units were unplugged, then plugged the first unit in. It reinstalled the BT driver, then let me upload a sketch after I labelled the unknown COM3 in the IDE as an Uno R4 Wifi. Then after uploading the sketch, disconnected the first unit, connected the second one, and uninstalled COM4, and did the rest. Works well now 
1 Like
I am still not able to download to board using Mac Mini M1 after upgrading IDE. I get the following error message:
No device found on cu.usbmodemDC5475C624B82
Failed uploading: uploading error: exit status 1
Shows up as port : /dev/cu.usbmodemDC5475C624B82
Hi @crewze. I'm going to ask you to post the full verbose output from an upload attempt.
This procedure is not intended to solve the problem. The purpose is to gather more information.
Please do this:
- Select File > Preferences... from the Arduino IDE menus.
The "Preferences" dialog will open. - Uncheck the box next to Show verbose output during:
☑compilation in the "Preferences" dialog. - Check the box next to Show verbose output during: ☐ upload.
- Click the OK button.
- Attempt an upload, as you did before.
- Wait for the upload to fail.
- You will see a "Upload error: ..." notification at the bottom right corner of the Arduino IDE window. Click the COPY ERROR MESSAGES button on that notification.
- Open a forum reply here by clicking the Reply button.
- Click the
<CODE/>icon on the post composer toolbar.
This will add the forum's code block markup (```) to your reply to make sure the error messages are correctly formatted.
- Press Ctrl+V.
This will paste the error output from the upload into the code block. - Move the cursor outside of the code tags before you add any additional text to your reply.
- Click the Reply button to post the output.
Sketch uses 36572 bytes (13%) of program storage space. Maximum is 262144 bytes.
Global variables use 2584 bytes (7%) of dynamic memory, leaving 30184 bytes for local variables. Maximum is 32768 bytes.
Performing 1200-bps touch reset on serial port /dev/cu.usbmodemDC5475C624B82
"/Users/georgeshafer_1/Library/Arduino15/packages/arduino/tools/bossac/1.9.1-arduino5/bossac" -d --port=cu.usbmodemDC5475C624B82 -U -e -w "/private/var/folders/wz/l727cf755q94g8srg7_ysmkw0000gp/T/arduino/sketches/56489CD67106152E13D04A01CDAF19FF/DisplaySingleFrame.ino.bin" -R
No device found on cu.usbmodemDC5475C624B82
Set binary mode
Send auto-baud
Set binary mode
Failed uploading: uploading error: exit status 1
This is not what was requested from you by @ptillisch .Wee need to see all the contents of the consul output, not just the last bit.
I have hit this occasionally, although different in that I am running on windows 11.
Typically I found that I could solve it, doing one of the following, sometimes a combination of the following:
a) Make sure there are no IDE windows with the Serial Monitor active - Often times I may have multiple sketches open, some may be for MINIMA others for wifi. Sometimes to make sure I close all other IDE windows.
b) Reset the board, better yet unplug/replug or in my case with USB HUB with switches turn it off/on
c) Sometimes double press reset button to enter DFU...
Thanks. Tried all of your suggestions and still have the same error. 
I ran into it again today, and tried most of the same things I mentioned and got the same error.
This time I resolved it, by:
Open up the example sketch blink:
Close all other sketch windows.
Make sure to reselect the board and comm port
And then do the upload.
And it worked. After that I could reopen the other sketch I was working on and it uploaded
Again not sure if it will be the magic bullet for you or not, but...
KurtE thanks for tip.
I opened the blink program and closed all the others but the download would still not work. I saved the blink program.
I then disconnected the board and restarted the Mac. I started up the IDE. I then connected the board. I was then able to download the program. Success.
Hopefully whatever the problem was, it is now gone.
1 Like
I ran into it again today... tried most of the things I mentioned in other posts.
This time again with blink, and with all other sketch windows closed, and Serial monitor closed, tried turning on and off, double click...
Finally it worked after, I tried holding the reset button down as I turned on power to the board, and then this time it programmed.
Not sure if that helped, or just lucky on that go around.
Note I am running a reasonably up to date nightly build.0714
I have not updated since then as I don't believe there have been any new updates (PRs that have been encorperated)
1 Like
Just created an issue on Github but decided to give your fix a try. Finally timed it right - seems to be a matter of timing. Had to release the reset button just about when it was ready to upload.
EDIT: Note this was on a Windows 11 machine
1 Like
Uploading to my R4 WiFi seemed flawless until I installed the Radio Module Firmware version 0.2.0 for BLE.
Now I have to unplug the board USB and plug it back in to upload consistently.
If I close any Serial Monitor windows it will upload inconsistently, failing more often than succeeding.
This is with Windows 10.
Hi everyone. I had the same problem: after trying to upload even a simple blink sketch it gave me error while uploading disconnecting the COM port.
*Re-installed IDE 2.1.1 -- nothing changed
*Changed various settings on device management -- nothing changed
*Tried different USB port -- same as above
*Re-installed board from board management -- still not working
Another solution (for those who have passed all steps and suggestions without results) is to unistall the board from board management and re-install with ver. 1.0.1 instead of 1.0.2... At least it worked for me and now I can upload sketches
1 Like
Upload broken after using brand new Uno R4 WiFi for ten minutes. I uploaded an example sketch that uses serial print and makes plots. I have IDE 2.1.1. I tried board package 1.02 then 1.01. I tried double pressing reset. I tried resetting during compile.
BN: Arduino Uno R4 WiFi VID: 0x2341 PID: 0x1002 SN: DC5475CE9674
Sketch uses 34820 bytes (13%) of program storage space. Maximum is 262144 bytes.
Global variables use 2460 bytes (7%) of dynamic memory, leaving 30308 bytes for local variables. Maximum is 32768 bytes.
Performing 1200-bps touch reset on serial port /dev/cu.usbmodemDC5475CE96742
"/Users/xxxxx/Library/Arduino15/packages/arduino/tools/bossac/1.9.1-arduino5/bossac" -d --port=cu.usbmodemDC5475CE96742 -U -e -w "/private/var/folders/f2/bnvlpc6s4k916z9yst5sh5zc0000gn/T/arduino/sketches/7605EFFCF9A3A8A31FFC5729DB77ADE2/sketch_aug25b.ino.bin" -R
No device found on cu.usbmodemDC5475CE96742
Set binary mode
Send auto-baud
Set binary mode
Failed uploading: uploading error: exit status 1
It's working now. I opened the serial monitor and adjusted the baud rate to match the sketch. It wasn't printing. I unplugged the USB and plugged back in. Printing started. Upload worked.
I just bought an Arduino Uno R4 and I've been having problems with the upload since day one. At first I would get the message "No device found on "port name"" but updating my OS operating system fixed that problem. Since then, I can upload sketches to my board but I have to reset the board (by pressing twice on the reset button) several times between each upload. The serial monitor shows that the sketch is compliling and uploading, but nothing happens on the board or, with my OLED screen, it starts printing white lines from top to bottom of the screen. If I reset the board a few times, then it works.
I've tried another port, another cable, same thing. Tried updating the board's firmware via the Firmware Updater but the install never ends. I have to force quit the IDE because I can't even stop the install.
I'm using IDE 2.2.1.
I'm this close to returning the board. What else can I try?