I was not able to bring them back to life even after plugging them into a computer and running particle update which should be the best update method. However, it sounds like your’s are still sending data? Mine weren’t doing a thing. The best troubleshooting is to download and flash the cloud debug from rickkas7. Unfortunately, if it’s the ublox module, you have to flash the debugger over usb and read the output over serial to confirm that the ublox module is indeed the culprit. https://github.com/rickkas7/boron-clouddebug