Unable to update my iPhone without storage

Hello,

If you are out of local storage you need to free some up before going on:

How to check the storage on your iPhone, iPad, and iPod touch

Note: local storage is not the same as iCloud storage:

About storage on your device and in iCloud

Good luck.

Hello!

If your iPhone won’t update, please see: If your iPhone or iPad won't update - Apple Support. 

👉 Updating iOS: common issues and solutions - Apple Community

👉 If you see error 9, 4005, 4013, or 4014 when you restore your iPhone

Have a nice day, and good luck!