oppo wireless reverse charging usage:
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1. First unlock OPPO Reno4 and click the \"Settings\" icon on the desktop of the phone in ColorOS version V7.2.
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2. Then tap [Battery] in the phone Settings menu.
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3. Then in the open battery page, turn on the switch to the right of [wireless reverse charging].
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4. Finally, put the two mobile phones back to back together to reverse charge.