The Advan S6 Plus (model 5502) is a 5.5-inch budget smartphone from 2018, featuring an 18:9 aspect ratio display. It is powered by a UNISOC SC9850KA processor and runs on Android 8.1 Oreo (Go Edition), which is optimized for devices with 1GB of RAM. This guide provides the official stock firmware packages to fully restore your device.
Crucial Information: The Advan S6 Plus 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 specific device, the other one should. 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 S6 Plus (5502)
- Release year: 2018
- Chipset: UNISOC SC9850KA
- Display: 5.5″ IPS LCD, 480 x 960 pixels
- RAM/Storage: 1GB/8GB
- Battery: 2450 mAh
- Original OS: Android 8.1 Oreo (Go Edition)
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 and are essential for your computer to detect the phone.
- A firmware package from the table below
- YGDP Tool (for the .cpb file)
- SPD Upgrade Tool (for the .pac file)
- Spreadtrum/UNISOC 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. We recommend starting with the newer build date.
| Build Date | Firmware Type | Required Tool | Download |
|---|---|---|---|
| 2019-12-07 | Stock ROM (.pac File) | SPD Upgrade Tool | Download |
| 2019-01-25 | Stock ROM (.cpb File) | YGDP Tool | Download |
How to Flash Stock Firmware
Follow the instructions for the type of firmware file you have downloaded.
Method 1: Flashing the PAC Firmware with SPD Upgrade Tool
This method is for the .pac file. Install the UNISOC 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.
Method 2: Flashing the CPB Firmware with YGDP Tool
This method is for the .cpb file. First, install the UNISOC 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.
Device-Specific Troubleshooting for Advan S6 Plus
- Which Firmware Should I Use?: Your device’s hardware is the same, but the software was packaged differently at different times. We recommend trying the newer firmware first (the .pac file from December 2019 with the SPD Upgrade Tool). If it fails to flash or your device doesn’t boot, then proceed with the other firmware (.cpb file with YGDP Tool).
- Drivers Are Essential: Both flashing tools rely on the same UNISOC SCI USB drivers. If your phone is not detected, 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.
- Restoring Android Go Performance: The Advan S6 Plus runs Android 8.1 Go Edition, which is very lightweight. If your phone has become slow, a full firmware flash is the best way to restore its original snappy performance by removing all software junk.
FAQs
- Q1. Why are there two different file types for the same phone?
- This often happens when a manufacturer changes its software flashing process during the device’s production run. While the phone is the same, the software is packaged differently, requiring a different installation tool.
- Q2. My Advan S6 Plus is dead and won’t turn on. Which file should I use?
- Start with the newer firmware (the .pac file with SPD Upgrade Tool). If the tool fails to detect the phone or gives an error, then proceed to the .cpb file and YGDP Tool. One of them should 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.
