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I can't install my new apk

 
ruby rails
Greenhorn
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I try to install a new apk with my mobile,the cmd give me wrong message 'INSTALL_FAILED_ALREADY_EXISTS', and I'm sure the old apk version code is '3', version name is '1.1',the new apk version code is 4 and version name is 1.2,but install failed also. if someone know how to fix it,tell me please. thanks.
 
Tim Moores
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Did you use the "-r" (for replace) option when using "adb install"? You need that when updating a package.
 
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