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I reflowed the solder on the USB connector. One now works, but the other is intermittent.

Please check the solder paste/mask and solder temperature in your assembly line.

I am using cables that work with other Arduino devices.

On plugging in there is a brief red, then green blink. I then goes into the alternating white/green blink.
Rescue mode is blinking green.
Factory reset is blinking red after holding the button. Then it goes back to white/green after the 3 presses.

3.08v on pin 2

4.94v on pin 4

I haven't reversed voltage since I have only used a USB cable, no external power.

There are no entries added to <dmesg | tail> for either rescue mode or factory rest mode.

Are there any dmesg flags that would give more detailed information?

Do you have a high resolution image of both sides of the board so I can check component placement?

I plugged in my printer and verified that dmesg reported its connection.

I executed <dmesg | tail> both before and after plugging in the device.

There were no new entries in the log.

Can I upload a screen image?

I purchased my devices from Amazon, can someone verify that they are authentic?

https://www.amazon.com/gp/product/B01IRBDBZY/

Thanks.

I have installed WindowsDriverUZB on the PC that is running Winver 1909, build 18363.900 The device still does not show an available Z-Uno port. I have tried 3 known good USB cables (these cables work with other devices). I have eliminated any hubs from the connection. Many other devices work on the...

I have followed the guide up to an error in step 10. I have installed the z-uno tools and selected the board and programmer as z-uno. (through step 8) I have skipped step 9 since I am on Win10, and I verified that there is no unknown device in device manager. (step 9) In step 10 I cannot select the ...