# ZTE > ๐Ÿงน This page is missing a lot of info! - Verdict: **๐Ÿ… Terrible!** Old devices (pre Android 8):
[xdaforums.com][pre-android-8] Devices Until Android 11 with engineering firmware:
[xdaforums.com][until-android-11-few-models] There is also a chance that your device is vulnerable to one of the MTK or Unisoc [exploits](/README.md/#universal-soc-based-methods). Side note, on the A11 link there is a collection of apps to grant a system shell, but they would probably only work on old models. *** Additional info provided by [Skorpion96](https://github.com/Skorpion96). Authored by [melontini](https://github.com/melontini). [pre-android-8]:https://xdaforums.com/t/bootloader-unlocking-on-older-qualcomm-zte-devices-devinfo-partition-modification.4100897/ [until-android-11-few-models]:https://xdaforums.com/t/zte-blade-a5-2019-2020-etc-root-guide-locked-bootloader-valid-for-all-unisoc-zte-models-with-an-engineering-firmware.4612391/ [unisoc-cve]:https://github.com/TomKing062/CVE-2022-38694_unlock_bootloader/releases/tag/1.72