Errors while updating iphone 4
Therefore, it is best to wait for a few hours or days before trying again, as the load on their servers will be reduced.
If none of the above solutions work for you, consider updating to i OS 12.4 via i Tunes on your computer.
Enable/ Disable Airplane Mode: Airplane mode is auto turn off Cellular data, the Carrier signal, and Wi Fi.
From the Control center Turn on for 10 seconds and Turn off again.
Tap on the “Close” button to exit this error message, and wait for a few minutes, and then tap on “Download and Install” again.
This time if it still stuck on that error screen, close it and try again.
But thankfully there are some solutions you could try to fix the i OS 12 – i OS 12.4 software update failed error that has been reported by some users.
You have probably tried this several times already.
This method is recommended for advanced users as it requires you to update to i OS 12.4 manually using i Tunes.
We’ve heard many users successfully download new i OS on the computer instead of OTA.