Saw this new feature in iOS Prestage Enrollment and no idea how does it work.
Couldn't find any article with relating to this.
How does it install configuration profile before I connecting to Wifi during setup assistant page?
The "Setup Assistant" screens referenced in the setting do not occur until after the DEP enrollment. After the DEP enrollment is where you'd see the following screens:
- Apps & Data
- Move from Android
- Passcode Lock
- Home Button Sensitivity
- Touch ID / Face ID
- Apple Pay
- Display Zoom
- True Tone Display
- Cloud Storage
- Apple Watch
- New Feature Highlights
- iMessage and FaceTime
- Screen Time
- Software Update
Of course you'd never even get to the Setup Assistant without connecting the device to Wi-Fi first.
What is the actual benefit of this feature?
One potential issue I can see is if a wifi connection configuration profile is used for the enrollment process (like through Apple Configurator 2 app), the MDM Profile installation step will actually remove the manually installed wifi configuration profile leaving the iOS device stuck at applying final configuration.