Advan S4X Stock Firmware
Advan S4X Stock Firmware is a Advan firmware file listed under Advan, distributed as Advan_S4X_V2.1_SPD.zip with a download size of 401 MB. It is built for Unisoc (Spreadtrum)-based devices. It is flashed with SPD ResearchDownload (or UpgradeDownload). It was published on June 16, 2026. This page has been viewed 14 times. It is available to download free of charge. Before flashing, verify the file matches your exact device model and back up your data.
About Advan S4X Stock Firmware
Here you will find all the latest Advan firmware for Advan S4X. If you are looking for Advan S4X stock ROM firmware, then you are on the right page. Before downloading, make sure your device is Advan S4X, if it is not, then flashing the below stock firmware can brick your device. The Advan S4X firmware helps in unbricking the device, updating the device to latest android version, revert the device back to stock, fix boot loop issues and several other issues on your device. Download Advan S4X Firmware File Name : Advan_S4X_V2.1_SPD.zip File Size : 401 MB Get Firmware Also: Advan S50 4G Stock Firmware How To Flash Advan S4X Stock Firmware Download and extract the Advan S4X firmware package on your computer. After extracting the package, you will find USB Drivers, flashing tool, and firmware files. Install the provided drivers on your computer. Skip this step if you already have the drivers installed on your PC. Launch the firmware flashing tool and load the Advan S4X firmware files inside the flash tool. Connect your device to the computer using USB cable and begin the firmware flashing process. Once the flashing is completed, you will see a success message. Disconnect your Advan S4X device from the computer and restart the device. Follow Detailed Instructions Important Notes : [*] Disclaimer : Firmware flashing is a tedious process and should be carried out only if you have enough knowledge. We, nor anybody, should be held responsible for any damage to your device. [*] Take a Backup : If you are going to flash the above firmware on your Advan S4X device, then make sure to take a backup of your data as it will be deleted after flashing the stock firmware. [*] Broken link? Report here . [*] Have we missed any device model? Let us know by contacting us via Contact U
File Details
| File name | Advan S4X Stock Firmware |
|---|---|
| Package | Advan_S4X_V2.1_SPD.zip |
| Brand / Platform | Advan |
| Category | Advan |
| Platform | Unisoc (Spreadtrum) |
| Flash tool | SPD ResearchDownload (or UpgradeDownload) |
| Package format | ZIP archive |
| File size | 401 MB |
| Date added | June 16, 2026 |
| Price | Free |
How to flash Advan S4X Stock Firmware with SPD ResearchDownload
- Confirm Advan S4X Stock Firmware matches your exact device model and that it is intended for Advan hardware.
- Back up your personal data, as flashing firmware can erase the device. Charge the battery above 50%.
- Download the file (401 MB) using the button above and extract it on a Windows PC.
- Install the SPD / Unisoc USB drivers, then open SPD ResearchDownload (or UpgradeDownload).
- In the tool, load the .pac firmware file from the extracted folder.
- Start the flash, then press Start in the tool, then connect the powered-off phone while holding Volume Down (boot key).
- Wait for the success message before disconnecting. Leave "Erase NV" unticked unless you intend to wipe IMEI and calibration data.
Guides for this firmware
- Flashing .pac Files with SPD ResearchDownload GuideSPD ResearchDownload (also known as UpgradeDownload) is a specialized flashing tool used to install stock firmware on devices powered by Unisoc (Spreadtrum) chipsets. It is primarily used to unbrick…
- How to Use SPD ResearchDownload: Firmware Flashing GuideSPD ResearchDownload (also known as UpgradeDownload) is a specialized flashing tool used to install stock firmware on devices powered by Unisoc (Spreadtrum) chipsets. It allows technicians and users…
Frequently asked questions
Is Advan S4X Stock Firmware free to download?
Yes, Advan S4X Stock Firmware can be downloaded free of charge from this page.
How large is the download?
The Advan S4X Stock Firmware package is 401 MB.
Which tool do I need to flash Advan S4X Stock Firmware?
Advan S4X Stock Firmware is Unisoc (Spreadtrum) firmware, so it is flashed with SPD ResearchDownload (or UpgradeDownload) using the .pac firmware file.
Which devices is this firmware for?
This file is intended for Advan devices. Always confirm it matches your specific model before flashing.