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Xiaomi Redmi 2A mobile phone brush shows "signature verification of update file failed", how to successfully brush the development version?
The "Update file signature verification failed" is displayed because the brush package is a third party, so the verification failed. Non-root mobile phones can only be updated with the official system upgrade package. You can download the upgrade package from official website. If the mobile phone has obtained root permission, in this case, brush a higher version and try again. Before brushing, uncheck the verification signature and brush again.

Brush machine is risky, please be careful.