Winmax S405
Winmax S405 is a Winmax firmware file listed under Winmax, distributed as Winmax_S405_SC6531E_V14_20180524_FSPD.zip with a download size of 3.54 MB. It is built for the Unisoc (Spreadtrum) SC6531E chipset, with a firmware build date of May 24, 2018. It is flashed with SPD ResearchDownload (or UpgradeDownload). It was published on April 28, 2026. This page has been viewed 29 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 Winmax S405
Winmax S405 Stock Firmware (Flash File) The Flash File will help you Upgrade, Downgrade, or re-install the Stock Firmware (OS) on your Mobile Device. In addition, the Flash File (ROM) also enables you to repair the Mobile device if facing any Software Issue, Bootloop Issue, IMEI Issue, or Dead Issue. File Name: Winmax_S405_SC6531E_V14_20180524_FSPD.zip File Size: 3.54 MB Flash Tool: SPD Flash Tool How to Flash (install): Follow Tutorial Get Link
File Details
| File name | Winmax S405 |
|---|---|
| Package | Winmax_S405_SC6531E_V14_20180524_FSPD.zip |
| Brand / Platform | Winmax |
| Category | Winmax |
| Chipset | Unisoc (Spreadtrum) SC6531E |
| Build date | May 24, 2018 |
| Flash tool | SPD ResearchDownload (or UpgradeDownload) |
| Package format | ZIP archive |
| File size | 3.54 MB |
| Date added | April 28, 2026 |
| Price | Free |
How to flash Winmax S405 with SPD ResearchDownload
- Confirm Winmax S405 matches your exact device model and that the phone uses the SC6531E chipset.
- Back up your personal data, as flashing firmware can erase the device. Charge the battery above 50%.
- Download the file (3.54 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
- SC6531E Firmware: Flashing Tools and Safety GuideThe SC6531E is a chipset from the Unisoc (Spreadtrum) platform used in various feature phones. To reflash or unbrick a device using this chipset, you will need the specific .pac firmware file for…
- 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 Winmax S405 free to download?
Yes, Winmax S405 can be downloaded free of charge from this page.
How large is the download?
The Winmax S405 package is 3.54 MB.
Which tool do I need to flash Winmax S405?
Winmax S405 is Unisoc (Spreadtrum) SC6531E 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 Winmax devices. Always confirm it matches your specific model before flashing.