Issue Description
iOS update downloads but fails to install.
Common Causes
Insufficient storage
Interrupted download
Server errors
Step-by-Step Solution
Step 1: Delete Failed Update
Settings → General → iPhone Storage
Remove update file
Step 2: Restart iPhone
Clear update cache
Step 3: Update Using Computer
Finder or iTunes method
Step 4: Retry on Stable Wi-Fi
Avoid VPNs and hotspots
Explore Further
Restore iPhone if update keeps failing
Prevention & Best Practices
Back up before updating.