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It's a big shame that this phone does not have any file manager by default.
I have the .apk installer of the file manager on my PC, but how to install it on phone offline? (offline = no internet connection)
Help
Plug the device into the computer, drop the .apk into the sd card and use the web browser to go to file:///sdcard and open the .apk file to install it.
adb install: How can I install an app given only its APK file? – Mr. Buster Dec 4 '13 at 23:26