An apk can be installed in Android 2.3 but not be installed in Android 4.0

Hello guys, I have a serious problem here. Hopefully, there is a sexy guy here who knows the solution.

So the thing is,

I built an application in unity(3.4.2f3, and Minimum API Level 6)

To test it, I tried to install it on the devices

  1. android 4.0.3 on samsung galaxy S2 GT-19100
  2. android 2.3.6 on samsung galaxy S2 GT-19100

The result is

  1. Application not installed.
  2. O.K. it runs well.

Doesn’t the unity version 3.4.2f3 support android 4.0.3?

Not installed or crashed? Android 4.0 has some orientation issues with some apps?

Do you have an old version installed on your 4.0 device which is signed with a debug certificate and now you try to install a version which is signed with your own certificate? This usually fails, because you can only update/upgrade only if both use the same certificate

What the…