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Download SP Flash Tools from this link : https://spflashtool.com/, then uncompress it.
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Connect your computer with R2 board by using USB-OTG wire.
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Open flash_tool, software like this
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Chick Format Tap, then choose Auto Format Flash and Format Whole Flash.
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Click start button, begin to format R2 board flash.
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Power off the board, then power on it. Choose Download Tap, flash_tool will select the relevant images by default, click download button begin to download images to R2 board.
7.Now we have burned images to R2 board.