Amazon Fire TV Cube 3 Exploit Unlocks Root Access and Bootloader
A public exploit package now allows persistent root access and bootloader unlock on Amazon Fire TV Cube 3 devices running older firmware, enabling deeper system modifications.
Owners of the third-generation Amazon Fire TV Cube can now achieve persistent root access and unlock the device's bootloader, provided they are running firmware version PS7717 or older. A public exploit package, released by XDA developer Pro-me3us, targets devices codenamed "gazelle" and combines temporary root privileges with a discovered bootloader vulnerability to facilitate these advanced system changes.
The exploit chain, as detailed in an XDA development thread, enables users to install custom recovery environments like TWRP and system modification tools such as Magisk. This opens up possibilities for installing alternative operating systems, custom launchers, and modifying core system partitions. However, the developer issues a stern warning that the process carries a risk of permanently damaging the device. It also automatically performs a factory reset and requires approximately 1.5GB of free user storage to maintain the unlocked state.
The technical process begins by enabling and authorizing Android Debug Bridge (ADB) on the Fire TV Cube. A temporary root tool is then utilized to grant the unlock script the necessary permissions. Following this, the device reboots into TWRP recovery to finalize the bootloader unlock and system modifications before returning to the FireOS interface for initial setup.
Several researchers are credited with contributions to this exploit. Pro-me3us is recognized for integrating the various components, while mforce2 is noted for porting the Ghostlock exploit, associated with CVE-2026-43499. NebuSec developed the original exploit chain, and John Red is credited with discovering the critical bootloader vulnerability. The work also builds upon earlier research into Mali GPU drivers, specifically mentioning CVE-2022-38181 and CVE-2022-46395 by Man Yue Mo, which provided foundational information for testing and analysis.
Once the bootloader is unlocked, the Fire TV Cube gains support for Magisk, allowing systemless modifications, and TWRP for custom recovery and backups. Users also gain unrestricted fastboot access and the ability to enter Amlogic download mode. Furthermore, access to the U-Boot command line over Ethernet and the option to boot from USB storage become available, transforming the streaming device into a more versatile platform for enthusiasts.
Version 1.2 of the exploit package, released on September 30, 2026, includes updates to the temporary root tool to support firmware PS7717/5741, an upgrade to Magisk version 30.7, and a fix for local ADB connectivity. It also includes a step to clear the 'misc' partition, which can help mitigate issues with pre-downloaded firmware updates that might interfere with the unlocking process.
It is crucial to note that this exploit requires authenticated ADB access and is not presented as a remote, unauthenticated attack vector. There are no reports of malicious actors exploiting this vulnerability in the wild. The developer has implemented measures to disable automatic firmware updates to preserve the unlock, creating a security trade-off for users who choose to proceed. Researchers and users are strongly advised to back up their data, verify their device model and firmware, and carefully consider the risks of permanent damage before attempting the unlock.