Apple no longer signs iOS 13.2.3. This means that it cannot be installed on the device. Roll back also does not work.
Now the current version of the system is iOS 13.3.
Apple blocks downgrades to iOS 13.2.3 following last week’s release of iOS 13.3 – 9to5MacApple this evening has quietly stopped signing iOS 13.2.3 and iPadOS 13.2.3 following the release of iOS 13.3 last week. What this means is that it? S no longer possible to downgrade from iOS 13.3. Now that Apple has stopped signing iOS 13.2.3, it means that no one can downgrade from iOS 13.3 to that version?9to5mac.com