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I want to switch back to iOS12.3 from iOS 13.

For this apple support says that It can be done by restoring backup from iTunes:

But iTunes is not installed on my Ubuntu computer. so How to switch back to original iOS from iCloud backup?

One crude way I understand, is to format iPhone and this will turn phone into new one, then I can restore the backup from iCloud. Will formatting the iPhone restore the iOS 12.3 ?

Edit: I erased everything, and restarted as new iphone/also restored from very old icloud backup. But phone didn't switch back to iOS12.3.

  • You have run an iCloud backup after upgrading to iOS 13? – nohillside Jul 31 at 8:48
  • @nohillside, Not sure, I will have to check, but most probably it has been back up after iOS13 – math Jul 31 at 9:05
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If you have ran a backup using iCloud while on iOS 13, and you don't have iTunes, there is unfortunately nothing you can do. If you have iTunes, you could restore from an old backup if you have one, or you can set up as a brand new phone on iOS 12.3 if you download the .ipsw file for your phone model and correct iOS.

  • Yes I have ran a backup using iOS13, but after resetting, and restored from an old back up (iOS 12.3), but it didn't remove iOS13. – math Aug 2 at 5:05
  • How did you do a reset? Just Erase Contents & Settings? I would recommend trying a Recovery Mode Restore. Documentation on how to do that is here: support.apple.com/en-us/HT201263 – CrashBurner Aug 5 at 15:27
  • Yes, using Erase Contents & Settings, In attached link of yours, it says to use iTunes!, and i dont have iTunes. Anyway, I waiting August to pass and stable release to come in september. – math Aug 7 at 4:11
  • Just using Erase Contents & Settings does just that - erases the contents and device settings. It unfortunately does not erase the current operating system. In order to do that, you will need to use iTunes. You can either install it to your operating system (lifewire.com/how-to-use-itunes-on-linux-1999251), or take it to an Apple Store or AASP (Apple Authorized Service Provider), and they will be able to do it too. – CrashBurner Aug 26 at 21:45
  • Thanks for writing, Yes, I have done it using itunes. – math Aug 28 at 5:54

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