Hi Nurhidayat,
Don't worry, this is a pre-release (like beta), you have to upgrade to a stable release. The upgrade process is the same way than other upgrade.
The release 5.0 was the first one for ERS3500.
I recommand you to upgrade to 5.2.3 release.
To check the origin of Avaya Swith, try to contact Avaya support.