Updating an iphone to version 2 1
Apple this morning released an updated version of i OS 12.1.2 that features a new "16C104" build number, up from the "16C101" build number used for Monday's release.
We don't know why Apple has released a new version of i OS 12.1.2, but the updated build is likely meant for those who have not yet updated to the new software.
Install i OS 7.1.2 update via i Tunes Some folks prefer to physically connect their i OS device to a computer via a USB cable and update their phone via i Tunes.
Since you are not dealing with Wi-FI signal, there is less chance of an error occurring during the download and install process. take a moment to make sure you are using the latest version of i Tunes.
Wait patiently and do not disconnect your device until the update has finished.
Install i OS 7.1.2 update using firmware file via i Tunes If you’re confused about which firmware file to download, then check out this link for i Phone and this one for i Pad to identify which firmware file to download based on model number.
Apple just released i OS 7.1.2 for i Phone, i Pad and i Pod touch for bug fixes and security updates.
i OS 12.1.2 is available only on the i Phone, and it can be downloaded over-the-air in the Settings app.
If you get tired of waiting for the download to finish (it could take a while) then go do something else.