Background: I was trying to set WiFi credentials via a program. But when tried with WEP authentication the Core went crazy on me. Green LED flashing, and I could not reset it to Factory Default. Every time I hold the MODE button - the LED when off (there is no any color, just off).
That sounds an awful lot like you're holding down the RESET button...
Could you take a look at the docs again on how to do the Factory Reset? http://docs.spark.io/connect/#appendix-factory-reset
Let me know if that worked for you.
Thanks. Yes, I did tried that before and again just now to make sure I got it right. And I have reset the unit before - many times - as a newfie well I experimented
While holding to both buttons (LED went off - once the RST button is pressed - you were right I get those two buttons inverted while writing my first message). Then release the RST button, while still keeping MODE pressed. Here is what the LED does:
Flash Green (not Yellow)
OFF
Flash While
(PS: If I hold longer the it cycles: Flash Green, OFF, Flash While)
Flash Blue
Then I tried to connect to it via iPhone Tinker - Same network with the Core supposed to be (and it was there before, Router is about 2m away). Could not connect to it.
While trying the LED does this:
5) Solid Blue
6) Green Flash