Opening Joulescope UI 0.10.10 (macOS 10.15 | Intel x86_64 variant) and plugging in a brand new JS220 shows this prompt:
Relevant text:
Upgrade firmware?
app: 1.0.3 => 1.0.4
fpga: 1.0.3 => 1.0.2
I’m worried about the suggestion that the FPGA firmware will be downgraded, so will happily hold off until I have more experience or hear further advice.