User level: Level 1 (4 points)Hi! I was looking to see if there is any way i could restore an unsigned IPSW/iOS 18 and below to my iPhone 13 Pro, i do also own an iPhone 16, but it works perfectly fine on iOS 27.
Anyways, back to my question.
The iPhone 13 Pro is fairly old and iOS 26/27 doesn't run the best on it so i'm looking if there's any way to restore iOS 18 or below, since the phone worked perfectly with that version.
Posted on Oct 24, 2026 10:46 AM
User level: Level 10 (105,996 points)Oct 24, 2026 10:54 AM in response to 05vl
Nope.
For your iPhone 13, the first thing you would want to check is your Battery Health at Settings > Battery > Battery Health. If it is under 80%, then it needs to be replaced and you may also have the Service required message showing.
That phone was only expected to last 500 charge cycles before needing a battery replacement. For a battery that is failing, whether it worked better with a previous iOS version is irrelevant, as that battery should be replaced anyways. It's like a car battery that needs replacing, where it may seem to work fine during the day but doesn't want to start on a cold morning. Of course the weather is not the problem and the answer isn't to move to a warmer climate, it is just that the battery needs replacing.
User level: Level 10 (756,437 points)Oct 24, 2026 10:46 AM in response to 05vl
No.
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Originally posted at discussions.apple.com/thread/256382207