Oh. You need a new INF file for the bootloader! You can download the Bootloader INF from GitHub. As we found out last time, make sure your browser saves it as “joulescope_bootloader.inf” and not “joulescope_bootloader.inf.txt”. You should then be able to follow the instructions here, but this time for the Joulescope Bootloader.
Disconnect and reconnect your Joulescope, and all should be good. The Joulescope UI will then detect the bootloader and restart the firmware upgrade (even if you have exited the Joulescope UI).