A sales representative is trying to install the latest iOS update over-the-air. The download completes while the phone is on a strong office Wi-Fi network, and 5 GB of free storage is available. However, each time the install is started, the message "Unable to install update" appears and the process stops. The battery indicator shows 32 % and the phone is not connected to a charger. Which action should you recommend first to let the update succeed?
Plug the phone into its AC charger until the battery exceeds the required charge level.
Move closer to the access point and repeat the download on Wi-Fi.
Delete additional photos and apps to create more free storage space.
Temporarily disable the corporate VPN before restarting the update.
Over-the-air updates on iOS and most Android devices require either (a) the battery to be at least about half-charged or (b) the handset to be connected to external power. Even when adequate storage and Wi-Fi are available, the installation phase will be blocked if the battery level is too low because the device must remain powered throughout firmware flashing and post-install tasks. Connecting the phone to a charger (or fully charging it past the minimum threshold) removes this safeguard and allows the update to proceed. Freeing additional storage, disabling VPN, or switching networks will not resolve the installation error when power requirements are not met.
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Why do over-the-air updates require a minimum battery level or external power?
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What happens if a device loses power during a firmware update?
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How does the update process differ from downloading the update?