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Firmware upgrade issue

Hi, Please advise, I have a issue during upgrade of Sonoff POW & Sonoff 4CH Pro devices, both upgrade are not passing to 90% , please find the attached snapshots and advise me further. Your swift response is awaited. Thanks. Fouad
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I have the exact same issue with a Mini that I just purchased. Attempting to upgrade from 3.0.0 to 3.3.0. Goes to 90% then stops and eventually times out with failure.

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