If you need the file for archival or advanced research purposes, you can find it on community-driven sites: Go to the iPhone 8 (GSM) page on IPSW.me . Identifier: Ensure you choose iPhone10,4 (the GSM model). Build Number: The specific build for iOS 12.1 is 16B92 . 🛠️ Official Installation Method (Latest Available)
Apple uses a "signing" system to control which iOS versions can be installed. iOS 12.1 is currently unsigned. Download iOS 12.1 for iPhone 8 (GSM)
If you have a signed IPSW file and want to install it manually: iPhone 8 (GSM) IPSW Download - iClarified If you need the file for archival or
You can technically download the iOS 12.1 IPSW file for your iPhone 8 (GSM) Go to product viewer dialog for this item. iTunes or Finder will block the installation of
iTunes or Finder will block the installation of unsigned firmware.
Since iOS 12.1 is blocked, you should install the latest supported version for the , which is . Over-the-Air (Easiest) Open Settings > General . Tap Software Update . Select Download and Install . Using a Computer (Manual IPSW)
from third-party archives, but you under normal circumstances . Apple stopped "signing" iOS 12.1 for the Go to product viewer dialog for this item. in December 2018. ⚠️ The Signing Problem