Thanks. I just 1) flashed V1.4.0, seeing it is released, which amounts to flashing a new bare Tinker install, and 2) discovered this thread:1.3.1-rc.1+ change to Boron solar charging (via VUSB) behavior
What do you know, now the Boron starts up and connects to cellular with USB only power without any problem, rather than suddenly crashing/dying on startup.
Amazingly, just like that OP, this yet-another Particle software-related update-related catastrophic failure necessitated a 3-hour drive, and will necessitate another 3-hour drive to my remote site.
Just like that OP, I am charging on Solar and needing reliability.
I know this is correlated to the PMIC charging / V1.3.1 issues because two or so weeks ago I found PMIC calls crashing Boron, and the solution was to remove them.
Recently I remotely flashed the code to this Boron restoring the PMIC calls seeing that the LiPo was failing to charge from USB by default settings.
Why does Particle post software updates that massively affect and destroy this product’s usability and necessitate more and more hours of repair, figuring out, and posting on forums?
How can we understand the hard rules and practice guidlines for USB-in solar charging for V1.4.0?
Thank you for your help.