The Gabb Z2 (model ZTE Z5157Y) is a unique smartphone designed from the ground up to be a safe communication tool for kids and teens. Marketed by Gabb Wireless, it runs a specially modified version of Android 10 that provides essential functions while removing the internet browser, social media, and the app store. Powered by a MediaTek Helio A22 (MT6761) chipset, it’s a focused device for calls, texts, and GPS tracking. This guide provides the official stock ROM (firmware with scatter file) for the Gabb Z2, which is essential for unbricking the device, fixing software bugs, or performing a complete factory restore of the original Gabb OS.
Important: This firmware is specifically for the Gabb Z2 (Z5157Y). The flashing process for MediaTek devices requires specific tools and drivers. Following these instructions carefully is crucial for a successful restoration.
Quick Device Specs
- Device: Gabb Z2 (ZTE Z5157Y)
- Release year: 2021
- Chipset: MediaTek Helio A22 (MT6761)
- Display: 5.5″ IPS LCD, HD+
- Battery: 2650 mAh
- Original OS: Android 10 (Gabb OS)
Required Downloads
As a MediaTek device, the Gabb Z2 requires specific tools for flashing.
| File / Tool | Download Link |
|---|---|
| SP Flash Tool | Download Latest Version |
| MediaTek VCOM USB Drivers | Download Drivers |
Stock ROM (Firmware)
| Region / Carrier | Build | Android | Type | Download | Chipset |
|---|---|---|---|---|---|
| US (Gabb Wireless) | V1.0.0B05 | 10.0 | SP Flash Tool Firmware | Download | MediaTek |
How to Flash (SP Flash Tool)
This method is for restoring the official stock firmware and will erase all data.
- Install Drivers: Download and extract the MediaTek VCOM drivers. Run the installer. You may need to disable Driver Signature Enforcement in Windows for the drivers to install correctly.
- Extract Tools & Firmware: Extract the SP Flash Tool and the downloaded firmware .zip file into separate folders on your desktop.
- Launch the Tool: Open the SP Flash Tool folder and run flash_tool.exe as an administrator.
- Load Scatter File: In the “Download” tab, click the “Scatter-loading File” button. Navigate to the extracted firmware folder and select the MT6761_Android_scatter.txt file.
- Select Mode: Ensure the dropdown menu is set to Download Only. Never use “Format All + Download” unless you are an expert, as it can erase your device’s unique identifiers (IMEI).
- Start Flashing: Power off your Gabb Z2 completely. Click the green Download button in SP Flash Tool, then immediately connect your powered-off phone to the PC with a USB cable.
- Finish: The process will take several minutes. Once a green checkmark appears, the flash is complete. You can disconnect your phone and power it on. The first boot will take longer than usual.
Device-Specific Troubleshooting for Gabb Z2
- Correct Driver Installation: The most common failure point is incorrect drivers. You must install the MediaTek VCOM drivers. On modern Windows, this often requires disabling ‘Driver Signature Enforcement’ first. Your PC should recognize the phone as a “MediaTek PreLoader USB VCOM Port” when it’s connected correctly for flashing.
- Using the “Boot Key”: To get the tool to recognize your phone, you must use the boot key. Power the phone off completely. Press and hold the Volume Down button, and while holding it, connect the phone to your PC with the USB cable. Release the button only after the flash process begins.
- Restoring Gabb OS Functionality: This firmware will restore the phone to the official Gabb OS, with all its built-in restrictions (no browser, no app store, etc.). This is the correct procedure if the phone’s unique software is malfunctioning or if you need to return it to its original “kid-safe” state for resale or warranty.
- SP Flash Tool BROM ERROR: This error is typically caused by incorrect drivers, a bad USB cable, or a security mismatch. Ensure drivers are installed correctly and try a different USB 2.0 port. Some newer MediaTek devices require an “authentication file” or a newer SP Flash Tool version, but this is less common for this model.
FAQs
Q1. What is Gabb OS? Gabb OS is a specially modified version of Android created by Gabb Wireless. It removes features like the internet browser, social media apps, and the Google Play Store to create a safe, distraction-free environment for kids.
Q2. Can I install a regular Android ROM on this phone? While it might be technically possible for very advanced users, it would defeat the purpose of the device and could lead to hardware compatibility issues. This stock ROM restores the phone to its intended software configuration.
Q3. What is a “scatter file”? The scatter file (e.g., MT6761_Android_scatter.txt) is a crucial map for MediaTek firmware. It tells SP Flash Tool the name, size, and location of every partition on the device’s storage, ensuring each part of the software is flashed to the correct place.
Q4. Will this process erase my data? Yes. Flashing the stock ROM will completely wipe all personal data from the device, including contacts, messages, and photos. Be sure to back up anything important if you can access the phone.
