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Just bought myself an Opus this week and had the same problem with updating the firmware. I found if the SD card was inserted prior to boot up the Opus just didn't see it. It was fine once it was on but that was no use to me trying to update it. Eventually I was able to update it by switching the opus on, pressing the button then inserting the card, all in that order. I'd like to say I found this all by myself but found a comment elsewhere on the internet solving the problem.
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