Can I Downgrade iPhone 6s?
Downgrade is Currently Not Supported
Apple is currently only signing iOS 15.8.8 for iPhone 6s. The signing window for iOS 15.8.7 and all earlier releases has closed.
Apple permanently closes the signing window for older releases within 1 to 2 weeks of launching a newer update. Because Apple's servers authenticate each restore online, trying to install any previous iOS build on iPhone 6s will immediately fail with iTunes Error 3194.
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Can I downgrade from an iOS Beta on iPhone 6s?
Yes. If your iPhone 6s is running an iOS Beta, you can always restore back to the latest signed public release using Recovery Mode in Finder (Mac) or iTunes / Apple Devices (Windows).
Can I downgrade to the iOS version iPhone 6s originally shipped with?
No. Apple permanently closes the signing window for older releases. Even though iPhone 6s originally launched with an earlier version, Apple servers will no longer authenticate that installation.
What can I do if I cannot downgrade iPhone 6s but experience battery or performance bugs?
You can perform a clean restore to the latest signed firmware using a computer to eliminate software glitches and corrupted cache, or await the next minor point update from Apple that includes targeted bug fixes.
Can I downgrade iPhone 6s if the signing window has closed?
No. Apple servers reject restore verifications for unsigned builds (returning iTunes Error 3194). Unsigned firmware cannot be installed on standard Apple devices.
Will restoring or downgrading iPhone 6s erase data?
Yes. Flashing an IPSW firmware file requires a restore that wipes on-device storage. Ensure your personal data is backed up to iCloud before proceeding.