Advan S50 4G Firmware Flash File Download [Stock Rom]

The Advan S50 4G is a 5-inch, entry-level 4G LTE smartphone from 2018. It is powered by a UNISOC SC9850KL processor and runs on Android 8.1 Oreo (Go Edition), a lightweight version of Android optimized for devices with 1GB of RAM. This guide provides the official stock firmware package to restore your device to its original factory software.

This firmware comes in the .cpb format, which requires a specific flashing utility called the YGDP (or QGDP) Tool. This process is the most effective solution for fixing critical software issues such as a completely dead phone (mati total), a device stuck on the Advan boot logo, or other system errors.

Disclaimer: Flashing this stock ROM will completely erase all data from your phone’s internal storage, including your apps, contacts, photos, and files. Please ensure you have backed up any important data before you begin.

Quick Device Specs

• Device: Advan S50 4G
• Release year: 2018
• Chipset: UNISOC SC9850KL
• Display: 5.0″ IPS LCD, 480 x 960 pixels
• RAM/Storage: 1GB/8GB
• Battery: 2000 mAh
• Original OS: Android 8.1 Oreo (Go Edition)

Required Downloads

To flash this .cpb firmware, you will need the YGDP Tool and the official Spreadtrum/UNISOC USB drivers. These drivers are essential for your computer to correctly recognize the phone in flashing mode.

• The firmware package from the table below
• YGDP Tool (also known as QGDP Tool)
• Spreadtrum/UNISOC SCI USB Drivers

Official Stock Firmware (ROM)

How to Flash Stock Firmware

To restore your Advan S50 4G, you must use the YGDP Tool. First, install the UNISOC/Spreadtrum drivers on your PC. Open the YGDP Tool, enter the password (e.g., ‘9527’ or ‘369’), and use the “Config” menu to load the .cpb firmware file. Click “Start” on the main screen. Power off your phone completely. Press and hold the Volume Down key while connecting the phone to your PC with a USB cable to begin the flashing process.

For a complete, step-by-step walkthrough of this flashing method, please refer to our detailed pillar guide: How to Use YGDP Tool to Flash CPB Firmware.

Device-Specific Troubleshooting for Advan S50 4G

• YGDP Tool Does Not Detect Phone: This is a driver issue. Ensure the UNISOC SCI drivers are installed correctly. Open the Windows Device Manager before connecting your phone; when you connect it in flash mode, a “Spreadtrum” or “SCI” device should appear briefly under the “Ports (COM & LPT)” section.
• “Invalid CPB File” Error: This error in the YGDP tool means your downloaded firmware file is incomplete or corrupted. Download the file again and ensure you are loading the .cpb file, not the .zip archive.
• YGDP Tool Password: The flashing tool is password-protected. The most common default passwords are 9527 or 369. You will need to enter one of these to log in and use the tool.
• Restoring Android Go Performance: The Advan S50 4G runs the lightweight Android Go Edition. If the phone has become slow or unresponsive, a full firmware flash is the best way to restore its original performance by removing all software clutter and providing a clean installation of the OS.

FAQs

Q1. My Advan S50 4G is dead (mati total). Will this firmware fix it?

Yes. If the cause of the dead device is corrupted software (a “hard brick”), then flashing this official .cpb firmware is the standard procedure to unbrick it and restore it to working condition.

Q2. What is a .cpb file and why can’t I use the normal SPD Upgrade Tool?

A .cpb file is a different type of firmware package used by some manufacturers. It requires the YGDP Tool for installation and is not compatible with the standard SPD Upgrade Tool which uses .pac files.

Q3. Will this process remove the Google Account (FRP) lock?

No. Flashing the stock firmware will restore the original operating system, but it does not bypass Factory Reset Protection (FRP). You will still need to enter the credentials of the last Google account that was synced to the device.

Q4. The tool gives an error and fails to flash. What should I do?

First, confirm your drivers are installed correctly. Second, use a high-quality USB cable and a main USB port on your computer (not a hub). Third, ensure the phone’s battery has a sufficient charge before starting the process.