The Advan S40 LTE is a compact 4-inch 4G smartphone released around 2018. Aimed at the budget market, it provides basic 4G connectivity in a small form factor, running on a Spreadtrum SC9850 processor and Android 7.0 Nougat. This guide provides the official stock firmware for the device.
Unlike most Spreadtrum devices that use .pac files, this firmware comes in the .cpb format. This requires a specific flashing utility called the YGDP Tool. This package allows for a complete software restoration, perfect for fixing a bricked phone (mati total), resolving a bootloop, or cleaning the system of malware.
Disclaimer: Flashing this stock ROM will completely erase all personal data from the phone’s internal storage, including your apps, contacts, photos, and messages. Please back up your data if your device is still accessible.
Quick Device Specs
- Device: Advan S40 LTE
- Release year: 2018
- Chipset: Spreadtrum/UNISOC SC9850
- Display: 4.0″ TN, 480 x 800 pixels
- RAM/Storage: 1GB/8GB
- Battery: 1500 mAh
- Original OS: Android 7.0 (Nougat)
Required Downloads
To flash this .cpb firmware, you will need the YGDP Tool and the standard Spreadtrum USB drivers. These drivers are necessary for your computer to correctly recognize the phone in flashing mode.
- The firmware package from the table below
- YGDP Tool
- Spreadtrum SCI USB Drivers
Official Stock Firmware (ROM)
| Build Version | Android Version | Type | Download |
|---|---|---|---|
| 7.0.015.P1.180515 | 7.0 Nougat | Stock ROM (.cpb File) | Download |
How to Flash Stock Firmware
Flashing a .cpb firmware file requires the YGDP Tool. First, you must install the correct Spreadtrum USB drivers. Then, open the YGDP Tool, enter the password (common passwords are ‘9527’ or ‘369’), and click “Login.” In the configuration screen, click the “Browse” button and load the .cpb firmware file. After the file is verified, click the “Start” button on the main screen. Power off your Advan S40 LTE, then press and hold the Volume Down key while connecting it to your PC 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 Use YGDP Tool to Flash CPB Firmware on Android Devices.
Device-Specific Troubleshooting for Advan S40 LTE
- YGDP Tool Does Not Detect Phone: This is a driver issue. Even though you are using YGDP Tool, the phone still requires the standard Spreadtrum SCI USB drivers to be recognized by Windows. Ensure the drivers are installed correctly and check for the device in Windows Device Manager.
- “The CPB file is invalid” Error: This error in YGDP Tool means the firmware file may be corrupted or incomplete. Try downloading the file again. Also, ensure you have fully extracted the
.ziparchive first, as you must load the.cpbfile, not the zip itself. - Flash Fails at a High Percentage (e.g., >90%): An error near the end of the flashing process can sometimes be misleading. It might be caused by an unstable USB connection. Before re-flashing, try disconnecting the phone and attempting to boot it up, as the main system partitions may have been flashed successfully.
- Password for YGDP Tool: The YGDP flashing tool is password-protected. The most common default passwords are 9527 or 369. You will need to enter one of these to access the main interface.
FAQs
- Q1. My Advan S40 is dead. Will this fix it?
- Yes, if the cause is a software brick, this firmware and the YGDP tool are the correct way to restore it. It is a low-level flash that can revive unresponsive devices.
- Q2. What is a
.cpbfile? Why can’t I use the normal SPD Upgrade Tool? - A
.cpbfile is a different type of firmware package, often used by manufacturers like Coolpad and sometimes by others for specific models. It contains all the same system data as a.pacfile but is structured differently and requires the YGDP Tool instead of the standard SPD Upgrade Tool. - Q3. What is the password for the YGDP Tool?
- The default assembly password for many versions of the YGDP Tool is ‘9527’. If that does not work, try ‘369’.
- Q4. Will I lose my data by flashing this firmware?
- Yes, this process completely erases the phone’s internal storage and restores it to its original factory state.
