The @pwn20wnd team today born a replacement beta release of Unc0ver 3.0 that adds partial support for A12-A12X Bionic devices just like the iPhone XS, iPhone XR, and also the 2018 iPad pro.

The release comes within days of the team adding support for 4K devices just like the iPhone 6 and iPhone 5s to Unc0ver.
The partial support implies that whereas you’ll use the latest version of Unc0ver to jailbreak your iPhone XS or iPhone XR, you can’t do anything. There’s no Cydia support for currently, therefore, you won’t be able to install jailbreak tweaks, though yes, jailbreaking can lead to updates being blocked and you may gain the ability to remount the root filesystem as RW.
There’s no word yet on when Saurik can add iPhone XS and iPhone XR support to Cydia
Below is that the full change-log of the release
- Enable partial (Export/Un-Export Kernel Task Port, Set HSP4 as TFP0, Dump APTicket, overwrite Boot nonce, Log Slide, Log ECID, Disable auto Updates, Remount RootFS, Disable App Revokes, Restore RootFS) iOS 12.0 – 12.1.2 support for A12-A12X devices
- Update the APT lists cache file for repositories
- Fix the voucher_swap exploit for the beta firmware on A12-A12X
- Update the APT lists cache file for repositories.
Most iPhone XS owners running iOS 12.1.1 b3 area unit reporting that their device finishes up rebooting during the breakout method. If you’re within the same boat, certify to place your iPhone in airplane mode before beginning the jailbreak method. Plus, an assay to form certain that no OTA file is saved on your iPhone as that might result in your device going in a reboot or respring loop.