Maybe your computer does not recognize the firmware file. So the first thing you need to do is restarting your computer. Then connect your iPhone/iPad/iPod touch to the computer again, and then launch iTunes. Try to restore your iDevice again.
Regarding this, can't restore because the firmware file is not compatible with iOS 13?
1. Restart the iTunes/Finder and PC to Fix "The Firmware Is Not Compatible" Issue. Firmware compatibility issues often arise because the computer was not able to find or recognize the right firmware files for your iPhone. In this case, you can simply restart your PC and iTunes to resolve this issue.
Likewise, how do I manually update my iPhone firmware? How to update your iPhone manually
- Start the Settings app.
- Tap "General," and then tap "Software Update." Your phone will check to see if there's an update available.
- If there is, tap "Download and Install." Wait while the update downloads to your phone.
- Tap "Install."
Similarly, you may ask, could not update iPhone because firmware file was corrupt?
If your iPod software update cannot be found or is corrupt, meaning that iTunes could not update or restore your iPod, you can delete the iPod software update files. iTunes will then be able to download a fresh copy of the latest firmware update from Apple, and you should then be able to install it.
What is iPhone firmware file?
A firmware is an IPSW file that contains everything needed to run the core operating system, iOS. Beta firmwares have also been released, but require an Apple Developer account to acquire. To check for updates, iTunes contacts itunes.apple.com.
