The Z3X tool is a commercial Windows-based software that interfaces with Samsung mobile hardware via a dedicated hardware dongle or smartcard box. Version 19.1 (v19.1) was a crucial legacy build released during the era of older Galaxy smartphones (such as the Galaxy S4, S5, and contemporary Note series).
Samsung Tool 19.1 was designed for technicians to perform low-level maintenance and "hacking" on Samsung mobile devices. Key features included: Device Management
Removing Factory Reset Protection (Google Lock) if the device is locked after a hard reset.
Choose your specific Samsung model from the list.
The tool operates by interfacing with a connected Samsung device via USB. It utilizes specific drivers to communicate with the device’s baseband processor and bootloader. The primary functions typically associated with this utility include: samsung tool 191
While powerful, the interface is designed to be intuitive, allowing technicians to select their model and function, then follow on-screen instructions.
To successfully use Samsung Tool 191, you need to prepare the following: A Z3X Box with a valid activation.
Developed by the reputable , SamsTool Online is a subscription-based, professional Windows software designed for diagnostic, repair, and restoration tasks on Samsung smartphones and tablets. It is considered the evolution of the earlier, hugely popular Z3X Samsung Tool Pro. Share public link
: Select the "Direct Unlock" button and follow the on-screen prompts (e.g., holding the power button). The Z3X tool is a commercial Windows-based software
: Wireless Bluetooth diagnostic connector featuring a built-in magnetic holder dock. Advanced Protocols: Future-Proofing Diagnostics
If you are still using Samsung Tool 191 in 2025, consider it only for (e.g., fixing an old Galaxy J7 for a child’s media player). For professional or daily repairs, investing in a modern tool will save time, reduce brick risks, and support ongoing development.
The tool allows advanced users to read and write security certificates. While marketed as an IMEI repair feature, altering IMEI numbers is illegal in most jurisdictions. Legitimate technicians use this only to restore original lost certificates after a full EFS corruption.
It can directly unlock network-locked Samsung phones, allowing users to switch carriers. This is particularly useful for removing SIM restrictions on imported devices. It utilizes specific drivers to communicate with the
Bypasses legacy Factory Reset Protection (FRP) and pattern locks for users locked out of their personal devices.
Using Samsung Tool 191 will trip the Knox eFuse on supported devices (from S6 onward). Once tripped, Samsung Pay, Secure Folder, and warranty are permanently disabled—even if you flash original firmware.
(e.g., Beginner, Professional technician) Share public link