copyright notice: this article is the original work of the blogger and follows CC 4.0 by-sa copyright agreement. Please attach the link of the original text and this statement.

the article links: https://blog.csdn.net/hyjecjtu/article/details/17677671 in the process of installation APK, because VersionName (version) in the process, because now installed version below your machine version, so there will be a Android Failure [INSTALL_FAILED_VERSION_DOWNGRADE]

solution: adb install -r-d C:\Users\ yj. Huang\Desktop\EEntry. Apk (package name)
— — —
copyright notice: this article is the original article of CSDN blogger “liitong”, following CC 4.0 by-sa copyright agreement, please attach the source link and this statement.
the original links: https://blog.csdn.net/hyjecjtu/article/details/17677671