I have a very small fleet of Particle Electron devices running under a product. They were all running system firmware 0.7-rc.7. Yesterday, I released a new version of the user firmware with 0.7.0 as the target system. All the devices updated successfully to 0.7.0 and they are running the latest version of the firmware.
Today, I tried adding new devices to my product that are running 0.7-rc.7. The devices seem to download the new user firmware but they do not seem to upgrade to 0.7.0. Once the firmware update is complete, they seem to enter safe mode. I had to manually update the system firmware 0.7.0.
Why would the devices stop updating their system firmware? I did not upload a new firmware version. The setup remains the same. Any comments on troubleshooting this problem is appreciated.