Most smartphones, mobile devices, and laptop computers require that the unit be plugged into power or have a certain battery level before an update can be installed.
When attempting to install an update there would normally be a message stating “You must plug into power before the update can continue.”
However, with the Apple iPhone iOS 10.3.1 update, it simply gets stuck during the update with a message stating “Update Requested” and no further information is provided.
Suggestions online include restarting the device and trying again, yet this obviously doesn’t help. The same message returns.
As soon as you plug the iPhone into power, the update should continue downloading. You’ll see a message indicating that the update is downloading. Once fully downloaded you can click on the Install Now link and the update will continue.
Your issue could be power related, but it may also be some other glitch in communicating with the update server. As one reader writes:
“I encountered this issue with 10.3.1 on one of my devices, and I don’t think it was power-related. In my case, switching Airplane mode on and then off kick-started the download. I suspect that there was a networking issue in my case.” ~ Tim of FriendlyTechie.net
So, you may want to try powering off and on, connecting to power, and perhaps switching into and out of Airplane mode to fix this issue.
Alternatively, you could try connecting your phone to iTunes and then performing the update through iTunes instead of over the air.