Phase 1: Prepare for the Upgrade
We recommend the following steps to prepare for an upgrade:
1. Ensure a 4.1 test environment exists.
2. Ensure a 4.1 development environment exists.
3. Create a 5.1 test environment.
4. Create a 5.1 development environment.
5. Build and test your applications under 4.1.
The following sections explain each of these steps.