Could not find USBtiny device (0x2341/0x49)

Development Tools IDE 1.x
1

Uploaded many sketches to my UNO all worked fine. Switched to MINI PRO uploaded once using CP2102 USB to TTL board. The scketch worked fine in MINI PRO. Tried to upload a second scketch to the MINI PRO and got errors and would not load again. Switched back to the UNO now it has loading errors to and all the scketches that worked before do not now. Got the error to read out (Holding shift while it uploads)
"Could not find USBtiny device (0x2341/0x49)

Win 10
Arduino 1.8.10

2

1.8.10 had quite a few issues.
You could try either moving to 1.8.11 or rolling back to 1.8.9

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3

Holding shift while it uploads

That causes the IDE to upload using programmer instead of IDE.

So the question is how you're trying to upload? Usual way via USB or using a programmer (the CP2102 is not a programmer)?

Please post the error that is related to the way you upload.

4

My apologies for not posting in the correct category. If you want me to move the post , let me know how to do that,Thank you all for your help. I misunderstood about "holding shift key down" I thought it just printed the error. I uploaded both the UNO and the MINI PRO by USB, the UNO directly from the laptop and the MINI PRO by way CP2102 USB to TTL to the laptop. The UNO loaded many time without a problem. It was not until I uploaded to MINI Pro that I started to get the error. Uploading from examples menu (blink, Button) still get the error. Changed to IDE 1.8.11 still have the same problem. I suspect the CP2102 USB to TTL might have changed my USB port on my laptop (I have IDE 1.8.10 on my desktop running win 8.1 and the UNO loads just fine no problems) I am new to Arduino but I am a network engineer and have an extensive electronic back ground. (So don't be afraid to use big words ha ha ) Thank you all - Gary

5

Problem solved. Deleted USB Root Hub in device manager. Did a restart on the laptop, Registry reloaded USB drivers and I am up and running. Thank you all - Gary