I have been using my core every day, except today it stopped letting me flash it.
I seem to have got stuck in a loop trying to fix it - this is what ive tried 3 times :
flashing blue (not breathing)
remove core from web app
add core in phone app
core flashes green
no cores found in app
replug in usb
I also tried, putting into yellow flashing mode and :
spark flash --usb cc3000
I have a few other cores which are still working fine.