In setup assistant after selecting country and signing into my WiFi my iPhone tries to activate. After a few seconds I get:
"Unable to Activate
Your iPhone could not be activated because the activation server cannot be reached. Try connecting you iPhone to a Mac or a PC with iTunes to activate, or try again in a couple of minutes.
If this problem persists, contact Apple Support at apple.com/support"
Restored on a MacBook 12" running macOS Big Sur beta 2
Shutdown iPhone on setup assistant screen and restarted.
Used multiple good Wi-Fi connections.
Also tried activating on Cellular.
Tried removing sim card and reinserted.
Tried a different sim card from the same carrier.
Re-downloaded iOS 14 IPSW file.
Put iPhone back into recovery mode.
Opened finder selected iPhone, held down option while clicking on restore.
Selected iOS 14 IPSW file.
Get the same activation error.
Put iPhone into recovery mode.
Opened finder, this time I selected restore without holding option.
iPhone restored back to iOS 13.
Also tried activating through finder and I get the following error: "Activation Failed The iPhone cannot be synced. Received an unexpected response from the device."
Still receive "Unable to Activate".