I have an Argon that was running 1.5.0 and I had to downgrade it to 1.4.1 in order to work with the Music Maker Feather Wing. I did the “downgrade” via the IDE with
Particle: Compile application and DeviceOS and then
Particle: Flash application and DeviceOS. (I had tried to do a manual downgrade, but things didn’t seem to work).
The device worked, as hoped, with Music Maker, but after I removed power, the Argon seems to start up and breath cyan, but it doesn’t run the application now. I flashed Tinker to it a couple times, but each time the iPhone app says something along the lines of “Tinker must be flashed” and when I do it, it immediately makes the same claim. I assumed it was some form of bootloader issue and tried to reflash the 1.4.1 bootloader (via Serial), but after several minutes, it didn’t stop flashing magenta intermittently.
I’m kind of stuck on how to get it healthy again on 1.4.1 and would appreciate any thoughts.
[update] BTW, if I reflash the program via --usb, it will run fine, but only until I cycle power and it simply breaths cyan, but does nothing.