When uploading to ATtiny817 Xplained Mini avrdude coughs

[felias-fogg]

When uploading a sketch to the ATtiny 817 Xplained Mini, in the end, you get the message:

avrdude: verifying ...
avrdude: 1006 bytes of flash verified
avrdude: jtag3_edbg_signoff(): unexpected response 0x03, 0x80

avrdude done.  Thank you.

Afterward, the programmer is in a confused state. It always replies with the following message when trying to upload:

avrdude: Version 6.3-20201216
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is ".../avrdude.conf"
         User configuration file is "/Users/.../.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : usb
         Using Programmer              : xplainedmini_updi
avrdude: Found CMSIS-DAP compliant device, using EDBG protocol
avrdude: jtag3_edbg_recv(): Inconsistent fragment number; expect 1, got 0

avrdude done.  Thank you.

Failed programming: uploading error: exit status 1

I guess, an upgrade to a more recent version of avrdude might help.