Q1. Why does this MediaTek phone use QGDP instead of the more common SP Flash Tool?

For certain models, manufacturers like Advan chose to package the official factory firmware in the compressed .cpb format. This file type is not compatible with the standard SP Flash Tool (which uses scatter files) and requires the specific software it was designed for, which is the QGDP tool.

Q2. Can I use this firmware to upgrade my phone to a newer version of Android?

No. This is the official Android 6.0 Marshmallow firmware, which was the final OS version released by the manufacturer for the Advan S4Z Plus. No further official upgrades are available.

Q3. I lost my phone's IMEI number after flashing. How can I fix it?

Losing the IMEI is a risk if the flashing process is interrupted or done incorrectly. The QGDP process is generally safe for the IMEI, but if it is lost, it will need to be restored using a separate, advanced tool for MediaTek devices like Maui META. Your original IMEI can be found on the phone's box or under the battery.

Advan S4Z Plus Stock Firmware (.cpb for QGDP)

The Advan S4Z Plus is a compact 4.0-inch 4G LTE smartphone from the Indonesian brand Advan, released around 2017. Running on Android 6.0 Marshmallow, it was designed as a highly affordable, entry-level device for basic communication. If your Advan S4Z Plus is bricked, stuck in a bootloop, or has become unusable due to software errors, flashing the official stock firmware is the definitive method to restore it to its original factory state.

Important Note: This firmware is packaged in the `.cpb` file format and must be installed using the QGDP Assembly Tool. This process is different from the more common SP Flash Tool and will completely erase all data on your device.

⚠️ Prerequisites: Before You Begin

Click Here for the Essential Pre-Flashing Checklist

Backup Your Data: All your files, photos, and contacts on the internal storage will be permanently deleted.
Charge The Battery: To prevent interruptions, ensure the phone’s battery has at least a 50% charge before you begin.
Windows PC & USB Cable: This procedure requires a Windows computer and the phone’s micro USB data cable.

📱 Quick Device Specifications

Device: Advan S4Z Plus
Release Year: ~2017
Chipset: MediaTek MT6735M
Display: 4.0″ WVGA LCD (800×480)
Battery: 1500 mAh
OS: Android 6.0 Marshmallow
RAM/Storage: 1GB / 8GB

🛠 Required Tools & Downloads

File / Tool	Download Link
QGDP Assembly Tool	Download Tool
MediaTek USB VCOM Drivers	Download Drivers

⬇️ Advan S4Z Plus Stock ROM / Firmware

Model	Android	Chipset	Type	Download	Size
S4Z Plus	6.0 Marshmallow	MediaTek MT6735M	QGDP (.cpb File)	MediaFire	895 MB

⚡ Quick Flashing Guide

Download and install the MediaTek VCOM drivers. Extract the firmware (Advan_S4Z_Plus...CPB.zip) to get the .cpb file, and extract the QGDP Tool.
Launch the QGDP Assembly Tool. If prompted for a password, enter 369 or 123456.
Click “Config” in the top left, select “Select CPB File,” and browse to the .cpb firmware file. Click “Apply.”
Click the large “Start” button to prepare the tool for flashing.
Power off your phone completely. Press and hold the Volume Down button, then connect the phone to your PC with the USB cable.
The tool will detect the device and begin the flashing process. Once the progress bar reaches 100% and turns green, disconnect and reboot the phone.

For a more detailed, step-by-step walkthrough of this process, please refer to our full guide:
👉 Full Tutorial: How to Flash .cpb Firmware with YGDP/QGDP Tool

❓ Frequently Asked Questions (FAQs)

Q1. Why does this MediaTek phone use QGDP instead of the more common SP Flash Tool?: For certain models, manufacturers like Advan chose to package the official factory firmware in the compressed .cpb format. This file type is not compatible with the standard SP Flash Tool (which uses scatter files) and requires the specific software it was designed for, which is the QGDP tool.
Q2. Can I use this firmware to upgrade my phone to a newer version of Android?: No. This is the official Android 6.0 Marshmallow firmware, which was the final OS version released by the manufacturer for the Advan S4Z Plus. No further official upgrades are available.
Q3. I lost my phone’s IMEI number after flashing. How can I fix it?: Losing the IMEI is a risk if the flashing process is interrupted or done incorrectly. The QGDP process is generally safe for the IMEI, but if it is lost, it will need to be restored using a separate, advanced tool for MediaTek devices like Maui META. Your original IMEI can be found on the phone’s box or under the battery.

🔧 Device-Specific Troubleshooting

QGDP Tool Fails to Detect the Phone: This is the most common issue and is almost always driver-related. First, reinstall the MediaTek VCOM drivers. Second, follow the connection sequence precisely: power off the phone, click “Start” in the tool, press and hold Volume Down, and only then connect the USB cable.
“Invalid CPB File” Error in QGDP: This error means the firmware file is either corrupted or not compatible with your version of the QGDP tool. Try to download the firmware file again. If the problem persists, you may need a different version of the QGDP tool.
Flashing Fails Before Reaching 100%: A flash that stops midway can be caused by a faulty USB port or cable. Always use a high-quality cable and a reliable USB port (preferably a USB 2.0 port). If it consistently fails at the same percentage, it could indicate a failing eMMC (storage) chip on the phone, which is a hardware issue.
Stuck on Advan Logo After a Successful Flash: If the tool shows 100% but the device won’t boot, a factory reset is necessary. Boot into recovery mode (usually by holding Power + Volume Up), and in the menu, select “wipe data/factory reset.” This will clear old data conflicts and allow the new system to boot.