I am using iPhone 14 Pro Max and been on 17.3 (I am few versions outdated lol) I've been trying many time for straight three days to update my phone but I experience the same thing. I already tried restarting my phone, turning it off, deleting the update on iPhone storage the try to update again, using different wifi network—BUT NOTHING HAPPENED.
So I am checking just this night if I can update already, but still no. So what I did is that:
- I plugged my phone to my Macbook using my lightning to type c cord then click "Trust the Device"
- Open Finder and look for the device name
- Click General then the update button
- Just agree with the terms, input your phone's passcode then wait.
- After the download for update is done, it will ask if you will continue with the update so just confirm
- Wait again then you're done!!!!!!
I just got mine updated tonight waiting for around 15 minutes only given my internet connection is weak, how much more if it's faster?!?? So try this now besties!
these might help you for much clearer instructions:
Update your iPhone, iPad, or iPod touch with the Finder - Apple Support
Update your iPhone, iPad, or iPod touch with iTunes - Apple Support