Today I compiled a known working project (1.2.1) on 1.4.0. After the Boron updated and uploading the new firmware over dfu the led on the Boron flickers white. After removing power 100% and reapplying power the device will try to connect and stays flashing green. When I put it in safe mode the device will reach Particle, flash red once, and then try to reconnect all over again. After about 20 attempts the led turns back to flickering and the boron appears dead. Reflashing tinker in dfu mode does allow the device to reconnect to Particle successfully.
Any thoughts on what might be going on? This firmware hasn’t changed in months now.