Is it possible to restore a backup from a iPhone SE on iOS 10.3.3, to a iPhone 5s iOS 9.3.4 that's jail broken though

Is it possible to restore a backup from a iPhone SE on iOS 10.3.3, to a iPhone 5s iOS 9.3.4 that's jail broken though

No, backups are not backwards compatible. You can't restore a backup onto an older iOS than it was made on.

No

I don't see why not.

Of course don't expect the jailbreak to remain once it is complete.

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