Apple on Wednesday stopped signing iOS and iPadOS 13.4, a move on the Cupertino-based company’s part that prevents its users from intentionally downgrading their handset’s firmware version to anything besides the latest release.
Notably, iOS and iPadOS 13.4.1 were only just released last week. Apple typically waits two weeks before closing signing windows for its firmware, but has demonstrated a more aggressive approach to this behavior more recently.