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I had the same issue.  Tried several different sd cards and finally a cheap class 4 pny worked.  I didn't believe those who said it was the sd card since i used mine on rpi, roku, odroid, et all with no issues whatsoever.  But that seems to be the issue.  I hope its a software issue rather than the opi being that picky about sd cards.  For this reason, I'll not recommend opi until it's less picky about sd cards. 
 
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