Anyone can use about 20 minutes

The public beta version of iOS 12 was already released. The Public Beta version that everyone can download without being a developer, unlike regular beta version. You can enjoy the new iOS officially released this autumn ahead!

Let's update it correctly.

• Access " Apple Beta Software Program " from Safari
• If already registered - Register or Sign in
• Enter the Apple ID verification code
• Scroll slightly down → tap "Register your iOS device"
• Tap "Download Profile" → "Permission"

At this time it will not respond properly unless you are accessing from Safari

• The setting application, click "Install" in the upper right → enter the iPhone passcode
• "Restart is required" is displayed, restart now
• After rebooting, tap "General" → "Software Update" from the setting application
• Display iOS 12 Public beta on the screen.

The update will take about 15 - 20 minutes.

Since the public beta version is a beta version only, there is a possibility of a bug. In addition, security may not be accepted if the public beta is inserted.

So it is recommended that you use Beta version on an extra iPhone.

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