I've been using IAR tools for many years & runing the latest tool set. However, I'm new to the Silicon Labs devices & my 1st project uses the EFM8SB10F2G. I have a J-link debug pod that I was unable to connect, but this is quite old. So I bought the Silicon Labs USB debug adaptor which now sees the device, but fails to download & reports the error below. So I installed Simlicity Studio & this worked fine, so I know my hardware is working. Has anyone else had problems like this & solved it?