@defragster: Yeah, I've already spent too much time on it today. I'm still debating whether I'll try the local server, or just go straight for the serial programming (probably the latter, because that should *just work*).
This last Oak of mine is acting strange -- differently from the other two. Some examples of odd behavior:
* Sometimes when I power it up, it will start out almost immediately blinking in the manner that indicates downloading. It spends several seconds like that (5-10 secs?), then appears to reboot and goes to one-blink-per-second.
* Sometimes, when I try to do the standard update, after providing my Particle and WiFi credentials, it *immediately* responds with a "failed to update" message.
* Sometimes when I try to do the update, the web page starts its 60-second countdown, but the Oak just reboots itself within a couple of seconds, apparently without having attempted an update, and my WiFi resets to my usual home SSID.
* Sometimes when trying the "slow" update, it will start blinking (downloading) about 10 seconds into the 180 second countdown, appear to download for about 10-15 seconds, and reboot. But when it's time to try the next step, the update has failed.
And the weirdest thing of all:
* Sometimes when I power down and back up again, I get a power light, but no status light. No blinking whatsoever. And no SoftAP SSID comes up. I can power down/up over and over, and it will be stuck like that. But if I remove power for an extended time (a minute, sometimes it seems to take more), it will seem to reset and either go to the 1/sec blink, or do the immediate update blinking behavior mentioned previiously.
@Erik -- Any thoughts on that?
I'm hoping I can try the serial upload later tonight.