OK, it's work fine, but now I have an other problem.
I made 2 projects
AAA.b4a and BBB.b4a
When I start in release mode the first project, an aaa.apk is installed on my phone. But when I start in release mode the bbb.b4a project, the aaa.apk disappears and is replaced by the bbb.apk.
I use the B4A bridge on USB.
What do I wrong?