If you want to downgrade from 17.6.1-18.1+ to iOS 17.6 (unsigned for about a month now), there's a method that still works thanks to iOS 17.6...
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The original was posted on /r/jailbreak by /u/DisastrousHoney4073 on 2024-09-27 21:09:19+00:00.

If you want to downgrade from 17.6.1-18.1+ to iOS 17.6 (unsigned for about a month now), there’s a method that still works thanks to iOS 17.6 betas being signed. Here’s how:

  1. Backup Your Device: Always back up your data before attempting any downgrade to avoid losing important information.
  2. Download iOS 17.6 Beta IPSW: Obtain the iOS 17.6 beta 1, 2, or 3 IPSW file here. These beta versions are still signed, making the downgrade possible.
  3. Install the IPSW via iTunes: Open iTunes (or Finder on macOS) and connect your iPhone. Hold the Shift key (or Option key on macOS) and click “Restore iPhone.” Select the downloaded IPSW file and let it install.
  4. Set Up Your Device: Once the installation is complete, set up your iPhone as you normally would.
  5. Install iOS 17.6 Profile: Visit delayOTA and download the iOS 17.6 profile. Install it onto your device.
  6. Reboot Your Device: After installing the profile, restart your iPhone.
  7. Connect to Power and Wi-Fi: Plug your device into a power source and ensure it’s connected to the internet via Wi-Fi.
  8. Update to iOS 17.6: Go to the Settings app, then navigate to General > Software Update. You should now see the option to install the official iOS 17.6.
  9. Complete the Update: Follow the prompts to update to iOS 17.6, and you’re all set!