The Acer Liquid Jade Z (model S57) is a slim, mid-range smartphone from 2015, praised for its lightweight design and capable 13MP camera. It is powered by the 64-bit octa-core MediaTek MT6752 chipset. This guide provides the official stock firmware package for the device, specifically the original Android 4.4.4 (KitKat) version.
This is a full firmware package designed for installation using the SP Flash Tool. It is the perfect tool for unbricking a dead phone, fixing software bootloops, or for users who wish to downgrade their device from the Android 5.0 Lollipop update back to the original, stable KitKat operating system.
Disclaimer: Flashing this firmware will perform a clean installation and will permanently erase all personal data from your phone’s internal storage. This includes apps, contacts, photos, and messages. Please back up your data before proceeding if possible.
Quick Device Specs
- Device: Acer Liquid Jade Z (S57)
- Release year: 2015
- Chipset: MediaTek MT6752
- Display: 5.0″ IPS LCD, 720 x 1280 pixels
- RAM/Storage: 1GB/8GB or 2GB/16GB variants
- Battery: 2300 mAh
- Original OS: Android 4.4.4 (KitKat)
Required Downloads
To flash this firmware, you will need the SP Flash Tool application and the correct MediaTek VCOM drivers for your Windows PC. You can find secure download links for these utilities in our comprehensive guide, linked in the how-to section below.
- The firmware package from the table below
- SP Flash Tool
- MediaTek VCOM USB Drivers
Official Stock Firmware (ROM)
| Build Date | Android Version | Type | Download |
|---|---|---|---|
| 2016-09-19 | 4.4.4 KitKat | Stock ROM (SP Flash Tool) | Download |
How to Flash Stock Firmware
To install this KitKat ROM on your Acer Liquid Jade Z, you will use the SP Flash Tool on a computer. First, ensure you have correctly installed the MediaTek VCOM drivers. Launch the SP Flash Tool, load the scatter file (MT6752_Android_scatter.txt) from the extracted firmware folder, and select your desired flashing mode (see troubleshooting below). Click the “Download” button. Power off your phone completely, then connect it to your PC with a USB cable to begin the flashing process.
For a complete, step-by-step walkthrough, driver downloads, and troubleshooting, please refer to our detailed pillar guide: How to Flash Stock Firmware with SP Flash Tool.
Device-Specific Troubleshooting for Acer Liquid Jade Z
- Downgrading from Lollipop to KitKat: This firmware is ideal for users who want to revert from Android 5.0 Lollipop back to Android 4.4.4 KitKat. When performing a major version downgrade, it is strongly recommended to use the “Firmware Upgrade” option in SP Flash Tool instead of “Download Only.” This performs a full format and ensures a clean installation, preventing potential boot issues.
- Fix for Lollipop Update Issues: Some users reported increased battery drain or performance issues after updating to Lollipop. Flashing back to this official KitKat ROM can often resolve these problems and restore the phone’s original stability and battery life.
- Driver Not Detected: The most common failure point is the PC not recognizing the phone. This is always a driver issue. Uninstall any previous drivers, restart your computer, and install the VCOM drivers fresh. The device should appear in Windows Device Manager briefly as “MediaTek PreLoader USB VCOM Port” when connected correctly.
- For Model S57 Only: Ensure your device is the Acer Liquid Jade Z (S57). While similar to other Jade series phones, using firmware for the wrong model can brick the device.
FAQs
- Q1. Can I use this firmware to go back to KitKat after updating to Lollipop?
- Yes, absolutely. This is the official Android 4.4.4 firmware package. For best results when downgrading, use the “Firmware Upgrade” mode in SP Flash Tool to ensure a clean installation.
- Q2. My phone is stuck on the Acer logo after a failed update. Will this fix it?
- Yes. A bootloop caused by a failed or corrupted software update is exactly the kind of problem this full stock ROM is designed to fix by completely reinstalling the operating system.
- Q3. Will flashing this firmware erase my data?
- Yes. The SP Flash Tool process will wipe all data from the phone’s internal storage, including your apps, photos, and personal files. It will restore the phone to its original factory state.
- Q4. SP Flash Tool shows a “BROM ERROR.” What does that mean?
- A BROM error indicates a failure in the initial communication between the PC and the phone’s chipset. This is typically caused by incorrect drivers, a faulty USB cable, or not connecting the phone at the right time. Reinstall drivers and try again.
