I've just got this UNO R4 WiFi and there is a problem. I can't upload to it. I have tried everything already before I came here. Probably spent around 4/5 hours on it. Here's a screenshot. I've tried everything, different data cables, settings, drivers, re-installing, rebooting... Old R3 UNO works …

hey everyone! Thank you for the massive amount of patience and support in helping us track this issue. We spent the whole day patching and releasing a patch fix to IDE 2.1 If you check for updates you'll see 2.1.1 available. That contains a new version of the Arduino CLI that fixes the serial re…

Ok I will be able to tell you more when my R4 arrives. Just ordered it and the Web site says it starts shipping the first week in July, which is just the other end of the weekend. It could be that your Windows machine has some sort user restriction and you don't have the permission to access this s…

This could be related to the discussion here .

Read this thread. None of the steps suggested worked. I have ordered 2 premium USB type C data cables form Amazon on the chance it might be the cables, although I'm not that confident that is the problem. Of the 3 cables I have tested, one of them is what I use with my audio device which should work…

I can confirm the IDE 1.8.19 has worked for me i now can upload sketches to my Arduino UNO R4 Wifi

Yeah, I also managed to get something uploaded using the legacy IDE. Although, the first time I did try it it did not work, but anyway. Happy now I know it wasn't my leads or a faulty board. I hope they fix the new IDE soon :slight_smile:

[image] lexx1973: I can confirm the IDE 1.8.19 has worked for me Also had the same problem and this solution works great! Albeit it is a tad disorienting to see the old IDE for the first time in so long LOL

I too have the Upload problem with both of my R4 Wifi Uno boards. I followed the instructions to delete the file folders of Bossac and dfu-util. I then deleted the 1.0.1 version of the board definitions for the R4 boards. I answered 'Yes' to the "dpinst-amd64.exe" install message because when I …

I have the same problem under Windows 10 = cannot upload to the UNO R4 WiFi (or the Minima). The upload process causes a momentary disconnection and then Windows sees it as being on a different COM port when it reconnects. The upload starts during the disconnection and then times out because the b…

Hi @flynace . We are aware of the problem with uploading to the UNO R4 WiFi. However, I haven't seen any reports of upload problems with the UNO R4 Minima. Despite the other similarities, there is a significant difference in the USB interface of the UNO R4 Minima and UNO R4 WiFi boards because the E…

Problem uploading to board

Official Hardware UNO Family UNO R4 WiFi

Topic		Replies	Views
Uno R4 Wifi Can't Upload Sketch to Board (No device found on COM4) UNO R4 WiFi	31	3792	July 29, 2024
Upload to UNO R4 WiFi fails: "No device found on ___" Uploading	32	284	July 23, 2026
Device Not Showing in COM Port UNO R4 WiFi	97	11322	February 19, 2025
Failed uploading UNO R4 WiFi	13	4374	October 6, 2023
Upload to UNO R4 WiFi fails: No device found on COM8 Uploading	1	229	May 8, 2024

Problem uploading to board

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