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2013年9月10日に発表されたApple iPhone 5sの修理情報とガイドです。モデル A1533、A1453、A1457、A1528、A1530、A1518。

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How do I undo an iPhone software update?

I allowed my iPhone to update to iOS 12.1 but was unaware that the new software would not sync with my MacBook, which is running El Capitan. I cannot run newer than this on the book so I need to take my phone back to an older iOS.

I can’t see how I can run a factory reset as iTunes doesn’t see the phone anymore.

Can anybody help with this conundrum?

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Unfortunately Apple doesn’t sign anything below 12.1 for your iPhone right now, no chance to go backwords. You’ll have to find another way around.

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You would need to download the IPSW (Apple iOS software) for whatever version Apple is still signing that works with your device and then restore through iTunes. You will lose data though most likely as iOS 12 and iOS 11 handle data differently. Likely anything you did after updating to iOS 12 you will lose. Here’s a link that lays out some info (there’s other similar sites out there). Do this at your own risk, I am not responsible for your data/phone.

https://www.newsweek.com/remove-ios-12-d...

How old is the MacBook? I’ve got a late 2011 running High Sierra.

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Peter Benson さん、ありがとうございました!
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