I haven't noticed any environmental specs published for any of the boards. I saw a blog post describing a single temperature test on the NEO where it survived -35, but nothing else. Has anyone done any environmental testing? I've been using the RPI3/4 for our field units for a few years now, and they survive the environment just fine (we've tested the RPI3 to -170C both running, warm booting, and cold booting), but the Pi just doesn't quite have the grunt we need for certain applications so I've been trying to source something else. Real world, I need an SBC that'll reliably cold boot at down to around -40. I can add a peltier to facilitate cold booting if necessary, but it's at least gotta survive -40 or so storage.