Palera1n Rootful work on iOS 18.3 Beta along with Cydia & Trollstore on iPad 7.
Also tested: Nugget 4.2+ on 18.3 & it works fine. (except gestalt tweaks).
If Interested, you can check the guides:
1. Palera1n iOS 18: youtu.be/FwRxs6rPxko
2. Nugget 4.2+: youtu.be/XLnNl9n82F0
Successful downgrade to iOS 10.0.1 using Turdus Merula using Linux without Blobs. Everything works. Passcode/TouchID/Jailbreak/WiFi/Installing Apps via sideloadly etc. You can downgrade to ANY iOS the device has ever run.
Tested on iPhone 7. Tested with iOS 10.3.3 as well.
If you want to jailbreak iOS 18.2.1 & Older using Palera1n Rootful, use Palen1x 1.1.8-works fine. Palen1x 1.1.9 beta just hangs with Rootful on 18.2.1 (as seen in image 2). Rootless is fine with any version of Palen1x.
Guide: youtu.be/FwRxs6rPxko
(Installs Cydia & Trollstore)