So it turns out that about half of the ExpLoRer boards I ordered work and half don't (I ordered 20 of them). Half of them when I opened them up out of the packaging and plugged them in had blinking blue LEDs and were recognized as a COM device and the other half didn't.
The ones that aren't working I've tried pressing the reset button multiple times, I've tried different USB cables, different USB ports, different computers and I can't seem to get them to do anything.
The ones that are working, when I put them into sleep mode I can get them to appear temporarily in the Arduino IDE by pressing the reset button, but the only sketch that will upload successfully is a blank sketch. Afterwards I can then upload any sketch I want.
Any suggestions on getting the non-responsive ExpLoRers working?