Hans

Here are the output logs when uploading using -vvvv. BTW, the schematic for the test board I'm using is this. I've removed R7 and R11, and is powering the board...

The patch is relatively simple, so it's fairly easy to rewrite it in order to drive the Scratchmonkey programmers from the existing stk500v2 isp/tpi, hvsp, and hvpp programmers. However, Avrdude...

I decided to briefly look into this again. It appears that Avrdude supports STK600 TPI programming, even though the documentation doesn't explicitly state that TPI programming works. I've not succeeded...

@dl8dtl do you think you have time to look at this issue before Avrdude v7.2 is ready to be released? UPDI support isn't that important, but it would be great...

@mcuee do you know if JTAG3 compatible programmers _has_ to use `hidapi`, or may they also use `libusb`? I was thinking about looking into this issue again, and I already...

@mcuee I think I have a working solution for hidapi. Would be great if you could give this a try: https://github.com/MCUdude/avrdude/tree/pickit4-snap-serialnumber. I'll look into how it can be accomplished with...

It doesn't work in ISP mode because of #1212, but this is a separate issue.

@mcuee I've just pushed now code that allows libusb to read and store the serial number as well. Can you try to download [Zadig](https://zadig.akeo.ie) and replace the driver Windows uses...

> It works well in printing out the serial number but then it does not go further. Kind of strange Does this happen with git main as well? I'm trying...

> Your modifications work well under macOS (only HIDAPI can be used). So please go ahead with the PR. Thanks. Thanks for testing! You can actually test libusb if you...