Upgrade Software Failed Verification. Is it because 1691 includes the rommon upgrade and 1664 does not. I had downloaded Latvian version for Firefox 15 and made a update package.
After they have been deleted go ahead and redownload them and try again. No luck so far. To remove unwanted data follow Settings General Storage iCloud Usage and tap Manage Storage.
In that case you can choose to restart iPhone to re-connect the network.
Using iMyFone Fixppo to Fix Verification Failed on iPhone During iPhone Update. It was set to auto-update but realised that it had not update for almost 6 months even though there were. Fix iOS 1131110 Failed Verification and Update iOS on Your iPhone Using Tenorshare ReiBoot Tenorshare ReiBoot is well-designed software that resolves iOS software issues such as failed verification boot loop iOS device stuck at Apple Logo iTunes failure to detect the device and iOS crashes among 50 other iOS issues. Just press and hold the Power until the power off screen appears.