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I am getting the blinking +/- since 3 days now. I cannot reset (either manually turning off and on again waiting for the red dot and three beeps or using the Home App). Nothing works. Is there any possible fix? I can only assume that this has happened due to one of the recent software updates. Which if true means I have a very expensive brick thanks to Apple. That is pathetic. I fear the only way to try and resolve this is having to waste half a day going to the nearest Apple Shop and arguing with them that my homepod did not jump off the shelf in the middle of the night and self-destruct.
Try this if not take in to Apple.
 
Installed without issue on my four Homepods. I wish I had more information on what this update provided exactly (oh well).
 
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