My download (when the screen on camera was blank) was almost 20 mins. Then the screen light up and update started. Less than 1 minute Ok appeared.
Maybe you didn't notice the OK.
I waited the download till finished (didn't take too long for download), then the nice update icons appeared on the E-M5 LCD. After 1-2 minutes the LCD went blank. I kept watching the LCD for the first 10 minutes after it went blank, but no 'OK' sign. So I left it and nervously waited the 'OK' for about an hour.
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