An iPhone 5 cannot be updated beyond iOS 10.3.3.
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10.3.3 is the maximum iOS version an iPhone 5 can update to.
If its having issues and slowdown, try some general troubleshooting.
- A Reset may cure some bugs. Hold down the Home and sleep/power buttons until the apple logo shows up.
If still not resolved:
- Reste al Settings. Go to Settings->General->Reset->Reset All Settings
If its still not resolved:
- Restore the device as new.
Question: How do I update my iPhone 5