For reference, here is some feed back on the new firmware rc.26 made available last night.
When flashing OTA to my existing mesh networks, build.particle.io returns a “Flash unsuccessful.” fairly quickly. However, I can see on the device it starts flashing magenta and it continues to flash magenta for a long time. Presumably, it is doing the “safe-mode self-healer” thing that takes a while. The one Argon I flashed on my home network seemed to have all LEDs off for an extended period which tempted me to want to power off or reset the device. But, I waited patiently and the flashing magenta started or came back eventually. Total flash time is about 2-3 minutes.
Flashing the Xenon acts just like the Argon with a quick “Flash Unsuccessful.” in WebIDE and then and extended period of magenta flashing (seems to take a bit longer than the Argon but not much.)
Just with the last 2.5 hours of testing, it seems that the marco-polo heartbeat tests still do not respond 100% of the time with only the Argon upgraded. I am flashing the Xenons now…