According to Reddit, Apple has enabled active when returning to the old iOS version without changing the wifi address if you want to downgrade.
This only applies to machines running A4, A5, A6, and A6X CPU chips.
If you want to downgrade to iOS 6.1.3 or 8.4.1, the users can easily activate the device if you use iPhone lock.
A reddit forum member returned to iOS 9.3.2 successfully (with SHSH Blobs saved).
Also, if you can save SHSH2 Blobs, or save SHSH2 Blobs to restore during the last Apple unlock, you can now go back to that iOS version and work well.
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