The Advan S40 is a compact 4-inch 4G LTE smartphone from 2018, designed for basic, affordable connectivity. It runs on a Spreadtrum SC9850 processor and Android 7.0 Nougat. This guide provides the official stock firmware packages to fully restore your device.
Crucial Information: The Advan S40 was manufactured with two different firmware formats. One version uses a .pac file and is flashed with the SPD Upgrade Tool, while another uses a .cpb file and requires the YGDP Tool. If one firmware type and tool does not work for your device, the other one will. Both firmware packages are provided below.
Disclaimer: Flashing any of these firmwares will completely erase all personal data from your 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
- 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
You will need the flashing tool that corresponds to the firmware you choose to download. The USB drivers are the same for both methods.
- A firmware package from the table below
- YGDP Tool (for the .cpb file)
- SPD Upgrade Tool (for the .pac file)
- Spreadtrum SCI USB Drivers (required for both tools)
Official Stock Firmware (ROM)
Choose the firmware and corresponding tool. If your device fails to flash with one, please try the other.
| Build Version | Firmware Type | Required Tool | Download |
|---|---|---|---|
| 7.0.042.P1_190214 | Stock ROM (.cpb File) | YGDP Tool | Download |
| 7.0.024.P1_180105 | Stock ROM (.pac File) | SPD Upgrade Tool | Download |
How to Flash Stock Firmware
Follow the instructions for the type of firmware file you have downloaded.
Method 1: Flashing the CPB Firmware with YGDP Tool
This method is for the .cpb file. First, install the Spreadtrum drivers. Open the YGDP Tool, enter the password (e.g., ‘9527’), and load the .cpb firmware file via the “Config” menu. Click “Start,” power off your phone, then press and hold Volume Down while connecting it to your PC to begin.
For a complete guide on this method, please refer to our pillar article: How to Use YGDP Tool to Flash CPB Firmware.
Method 2: Flashing the PAC Firmware with SPD Upgrade Tool
This method is for the .pac file. Install the Spreadtrum drivers. Launch the SPD Upgrade Tool, click the gear icon to “Load Packet,” and select the .pac file. Click the play icon to “Start Downloading.” Power off your phone, then press and hold Volume Down while connecting it to your PC.
For a complete guide on this method, please refer to our pillar article: How to Flash Firmware with SPD Upgrade Tool.
Device-Specific Troubleshooting for Advan S40
- Which Firmware Should I Use?: There is no physical difference in the phones; it’s a difference in software packaging. We recommend trying the newer build (7.0.042 with YGDP Tool) first. If it fails to flash or doesn’t work, then proceed with the other firmware (7.0.024 with SPD Upgrade Tool).
- Drivers Are Key: Both flashing tools depend on the same Spreadtrum SCI USB drivers. If your phone is not detected by either tool, the problem is almost certainly the drivers. Reinstall them and restart your PC.
- YGDP Tool Password: The YGDP flashing tool requires a password to log in. The most common default passwords are 9527 or 369.
- SPD Tool Stuck on “Checking Baudrate”: This is a classic Spreadtrum driver or USB connection issue. Reinstall drivers and use a high-quality USB cable connected to a main port on your computer.
FAQs
- Q1. Why are there two different types of firmware for the same phone?
- This can happen when a manufacturer uses different software suppliers or changes their internal flashing process during the production life of a device. While the hardware is the same, the software is packaged differently, requiring a different tool.
- Q2. My Advan S40 is dead and won’t turn on. Which file should I use?
- Start with the newer firmware (the .cpb file with YGDP Tool). If the tool fails to detect the phone or gives an error, then proceed to the .pac file and SPD Upgrade Tool. One of them will work if the issue is software-related.
- Q3. Will this process remove the Google Account lock (FRP)?
- No. Flashing the stock firmware restores the OS but does not bypass Factory Reset Protection (FRP). After flashing, you will still be prompted to enter the login details of the last Google account synced to the phone.
- Q4. Will I lose my data?
- Yes, both flashing methods will completely erase the phone’s internal storage and restore it to its original factory state.
