Clean install iOS 11, restore from iOS 10?

[frydrych]

Hi

Read something about benefits from doing a clean install of iOS 11 (i think it was file system related) but forgot exactly what it was about...

So the question is if it's possible to do a clean install of iOS 11 when available and then restore from iOS 10 backup? Previously that hasn't been a success for me... or do I have to run the beta, backup, then do a clean install and restore?

If anyone remembers what it was all about doing a clean install and have the time, I'd be grateful if someone posted a link about it...

Thanks!

F

 

[Broken Hope]

Doing an erase restore on iOS 11 will make sure the file system properly supports normalization. If you don't do an erase restore than the system will have to change the file normalization on the fly which would have a small performance penalty.

APFS accepts only valid UTF-8 encoded filenames for creation, and preserves both case and normalization of the filename on disk in all variants. APFS, like HFS+, is case-sensitive on iOS and is available in case-sensitive and case-insensitive variants on macOS, with case-insensitive being the default.

In macOS High Sierra, APFS is normalization-insensitive in both the case-insensitive and case-sensitive variants, using a hash-based native normalization scheme. In iOS 11, APFS is normalization-insensitive as well, using either a native normalization scheme (erase restores only) or runtime normalization scheme (upgrades from previous versions). Runtime normalization will also be available in iOS 10.3.3 and macOS Sierra 10.12.6. Being normalization-insensitive ensures that normalization variants of a filename cannot be created in the same directory, and that a filename can be found with any of its normalization variants. This means that developers don’t need to do any additional work to ensure correct normalization behavior in these versions of macOS and iOS.

https://developer.apple.com/library...f/doc/uid/TP40016999-CH6-DontLinkElementID_17

 

[frydrych]

That's it! Big thanks!

Maybe a stupid follow up question, but does this mean that you actually have to do both erase and restore with iOS 11 installed? The other way would be to do IPSW restore in iTunes, will this also work?

 

[Broken Hope]

I'm personally planning on doing an encrypted backup, installing the GM build and then doing an erase content and settings and then restoring my backup.

That should ensure everything is okay.

 

[fel10]

I always do a clean instal when a major IOS is released.

 

[frydrych]

I'm personally planning on doing an encrypted backup, installing the GM build and then doing an erase content and settings and then restoring my backup.

That should ensure everything is okay.

Sounds like a plan, back to the first question. Is it possible to do an iOS 10 restore on iOS 11? Haven't installed the betas yet even if I'm tempted...

 

[Mabus51]

Sounds like a plan, back to the first question. Is it possible to do an iOS 10 restore on iOS 11? Haven't installed the betas yet even if I'm tempted...

Yes it will be fine. I would recommend an iCloud backup & restore, but iTunes ones will work just fine.
What you don't want is to restore a backup from a beta as data from the beta will restore and can replace newer system files with older outdated ones.

 

[Broken Hope]

Older backup to newer OS is fine, newer backup to older OS isn't. So yeah a iOS 10 backup will work on iOS 11.

 

[frydrych]

thank you everyone for replying. Guess I'm all set for iOS 11 then...