Signed IPSW files can be restored via iTunes. Unsigned IPSWs cannot currently be restored via iTunes.
✗ | iPhone 8 Plus (GSM) | iOS 12.3.2 (16F250) | 10th June 2019 | 3.55 GB | iPhone_5.5_P3_12.3.2_16F250_Restore.ipsw |
✗ | iPhone 8 Plus (Global) | iOS 12.3.2 (16F250) | 10th June 2019 | 3.55 GB | iPhone_5.5_P3_12.3.2_16F250_Restore.ipsw |