Power cut, now device won't boot, breathing a sort of blue tinged white

[no1089]

That's really sad to hear. I've heard reports of repeated attempts working, so maybe try again?

The 5V from an Apple charger should be stable, but power outages have a way of wreaking havoc on electronics. I lost a router on Friday due to a power outage.

I'm assuming you've tried the steps outlined here:

Original Spark Core revival

You could try a deep update. Put the Core in DFU mode by holding down both the RST and MODE buttons, releasing RST and continuing to hold down MODE until it blinks yellow and issue the commands below, in order. After completing some of the steps the color may change to something else; if so note what color/pattern it is, then use the button combination to get back to blinking yellow. The core should be blinking yellow before each of the commands listed below is entered. particle flash --usb -…