The LYF Flame 5 (model LS-4002) was an ultra-budget 4G smartphone from 2016, designed to be one of the most affordable entry points into the 4G ecosystem. Its hardware is extremely limited, featuring a 4.0-inch display, a Spreadtrum processor, and a critically low 512MB of RAM. The device runs on Android 5.1 Lollipop, an operating system that struggles severely on such minimal hardware, leading to crippling performance lag, constant “insufficient storage” errors, and frequent app crashes. For owners of this phone, reinstalling the official stock firmware is the only effective way to restore a baseline level of functionality.
Crucial Safety Warning: This is a Spreadtrum (SPD) device. The firmware is a .pac file and must be flashed using the SPD Upgrade Tool or Research Download Tool. Do NOT attempt to use QFIL or SP Flash Tool, as they are incompatible and will not work.
LYF Flame 5 (LS-4002) Firmware Details
Below are the key specifications for the LYF Flame 5. Note the Spreadtrum chipset, which requires the specific SPD flashing procedure.
| Attribute | Details |
|---|---|
| 📱 Device | LYF Flame 5 (LS-4002) |
| 🆔 Chipset | Spreadtrum |
| 🤖 Android OS | 5.1 Lollipop |
| ✅ Software Version | V12_L901 |
| 📂 File Type | .pac Firmware |
| 💻 Flashing Tool | SPD Upgrade Tool / Research Download Tool |
Why Flash the Stock Firmware on Your LYF Flame 5?
Flashing the official stock firmware is the only viable solution for the severe, hardware-related issues this phone faces:
- Fix Extreme Performance Lag: A clean installation of this Android 5.1 firmware is the only way to address the severe system-wide lag caused by running the OS on just 512MB of RAM, making the phone usable for only the most basic tasks.
- Resolve “Insufficient Storage” Errors: Flashing this V12 firmware performs a full factory reset, clearing the tiny 4GB of internal storage to allow the operating system to function without constant errors.
- Stop Constant App Crashes: By restoring the original, lightweight Android 5.1 OS, you minimize background processes and give foreground apps a slightly better chance of running without crashing due to lack of memory.
- Unbrick a Dead Phone: Flashing the firmware is often the only way to revive a LYF Flame 5 that has become completely unresponsive or “hard bricked” after a failed update or software error.
- Fix Bootloop Errors: The definitive solution for a phone that is stuck on the LYF startup logo and fails to boot.
⚠️ Important Prerequisites
Before you begin, back up any accessible data. This process will completely erase the phone’s internal storage.
- The latest version of the SPD Upgrade Tool or Research Download Tool.
- The correct Spreadtrum USB drivers installed on your PC.
Download Official Firmware for LYF Flame 5 (LS-4002)
- Software Version: V12_L901
- File Name: Lyf_Flame_5_LS-4002_V12_L901_5.1.zip
- Size: 390 MB
- 🔗 Download Link: Download (MediaFire)
How to Flash the Firmware
This firmware must be installed using the SPD Upgrade Tool. The process involves loading a `.pac` file from the downloaded firmware. Here is a summary of the steps:
- Download and extract the
Lyf_Flame_5_LS-4002_V12_L901_5.1.zipfile. Inside, you will find the firmware file with a .pac extension. - Download and install the Spreadtrum USB drivers on your PC.
- Launch the SPD Upgrade Tool software.
- Click the “Load Packet” button (it looks like a single gear icon) and select the
.pacfirmware file you just extracted. - Completely power off your LYF Flame 5.
- Click the “Start Downloading” button (it looks like a play icon).
- While the phone is off, press and hold the Volume Down button, and then connect it to your PC via USB cable. The flashing process will begin automatically.
- Once the progress bar turns green and shows a “Passed” message, the flash is complete. You can now disconnect your phone and turn it on.
For a complete, step-by-step tutorial with screenshots and troubleshooting, please follow our master guide:
→ How to Flash .pac Firmware Using SPD Upgrade Tool
Disclaimer: Flashing firmware is an advanced procedure. Using the wrong tool or files can permanently damage your device. Given the severe hardware limitations of this phone, flashing may have unpredictable results. Proceed with extreme caution.
