The xenons I am using were purchased in November 2018. They were set up with out problems and used for testing/training purposes at the time with no issues. I just set them aside and worked on other projects for a while.
Here is what I have tried in the last couple of days:
Downloaded the iphone app on another good cell phone and tried again. Same symptom: bluetooth connection was dropped unexpectedly while beginning the update.
Went to a different location with faster internet. This is at a nearby factory and I tried it right in their programmers’ offices. Same symptom.
Concluding that this is a problem with my xenons, or firmware.
I used the dfu mode to update the firmware in my xenon using the below command in the command window:
C:>particle flash --usb C:\Users\Tom\Downloads\hybrid-0.8.0-rc.27-xenon.bin
It flashed successfully it said, however, I am used to seeing the xenon show a red/blue led while it is updating. I only observed a different rate of blinking the yellow led while it updated.
I went back to the particle app (ver v2.8.2) and began the setup again. This time, the xenon did not try to update, because I had just updated the firmware. The process went well, paired with the app, and I had the assisting device (Argon with new firmware loaded in it) blinking blue. Then the app paired successfully with the Argon. I selected the network and entered the password. As it tried to join the network and the iphone app displayed “adding xenon to the mesh network” the app suddenly reported “Error The Bluetooth connection was dropped unexpectedly…”
I tried it four times with the same results.