Only if Apple is still "signing" the older firmware version. Check IPSW.me to see authorized versions.
Use the Apple Devices app (latest) or the classic iTunes for Windows .
https://apple.com/itunes (or built into macOS Finder on Catalina+)
Unofficial programs can harvest personal data during the flash process. iphone firmware flash tool link
Always verify the SHA1 hash of your downloaded IPSW against the value posted on The iPhone Wiki.
Always use 3uTools or iTunes to create a full backup.
: A versatile alternative that supports a wide range of iOS devices, including Apple TV. Only if Apple is still "signing" the older firmware version
If you can tell me the and what problem you are trying to fix , I can provide a more tailored guide for your situation.
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Download Apple Devices via Microsoft Store or access iTunes via the Apple Downloads Page. https://apple
Still used on older Windows versions or for specific legacy devices.
: Connect your iPhone to a PC or Mac. You can use the Apple Devices app on Windows or Finder on macOS to "Restore" or "Update" your firmware.
This site provides download links for iPhone, iPad, Mac, Apple TV, HomePod, iPod touch, and Apple Watch firmware across every released version. Each listing clearly indicates whether the firmware is Signed (can be restored via standard tools) or Unsigned (requires SHSH blobs for restoration).
To flash or update your iPhone firmware, you can use official Apple tools for the safest experience or third-party software for more advanced needs like downgrading or fixing boot loops. Official Apple Tools
Hold down the (Windows) or Option key (Mac) and click the Restore iPhone button.