Can I Downgrade iPhone XS Max (China)?
No Signed Firmwares Available
There are currently no signed firmwares available for iPhone XS Max (China).
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Can I downgrade from an iOS Beta on iPhone XS Max (China)?
Yes. If your iPhone XS Max (China) 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 XS Max (China) originally shipped with?
No. Apple permanently closes the signing window for older releases. Even though iPhone XS Max (China) originally launched with an earlier version, Apple servers will no longer authenticate that installation.
What can I do if I cannot downgrade iPhone XS Max (China) 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 XS Max (China) 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 XS Max (China) 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.