I am using Mi Note3, before that, I can run the code from react-native using react-native run-android and connect with my phone. Now cannot already. My MIUI version is 10.2, I already open Developer options, USB debugging, Install via USB and turn off the MIUI optimization.
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have you checked version of you – Chanaka Weerasinghe Jun 21 '19 at 03:33
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Thank you for your reply, which version? for phone or react native? – dipgirl Jun 21 '19 at 04:22
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This happens when you try to update a signed release build with a debug build for instance. apk cannot be installed because its signature is incompatible with the currently installed version.The solution is to uninstall the existing app from the device.

Aurangzaib Rana
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Uninstall application once and then run command react-native run-android after connecting device.

shruti garg
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