If you are here you probably had the issue from the title the error INSTALL_FAILED_UID_CHANGED when you want to install for debug the app from Eclipse or Android Studio.
I had this issue yesterday and after hours of browsing the stackoverflow and groups and forums I found 3 methods to fix this.
1. if you test on an emulator then you just have to Clear/Wipe the AVD to defaults or create a new one.
2. you are on a real device. If you have root access to the device just go to folder
and delete it. You should ok now.
3. Device with no ROOT Access. On internet there is just one single method to factory reset the device. If this is acceptable for you this is easy.
None of this methods was OK for me. I was testing on a real device with NO-ROOT but I did not want to factory reset it. Continue Reading