I received a brand new Boron that was Flashing LED green endlessly. The left top LED was also flashing yellow very fast. After a log of digging around I found a link Boron FW restore - #25 by existech that indicated a solution. I downloaded the binaries and was able to restore the device to its slow blinking blue LED state. When I tried to add the device to cloud, after BLE pairing, a message popped up that Modem is not responsive, please waited. I have waited and waited and restarted to no avail. Any help would be appreciated!
That indicates you didn’t have a LiPo connected. To be on the safe side I’d definitely connect one to make sure the communication with the cell towers is stable.
Also, was the SIM activated correctly? Did you get a activation mail?