Q1. There are three firmware versions available. Which one should I use?

It is generally best to start with the newest available version (the build from November 2015). If you flash it and encounter hardware-related issues like an unresponsive touchscreen or incorrect display colors, it may mean your phone is an older hardware revision. In that case, you should try flashing one of the older firmware versions.

Q2. Why is the flashing tool stuck on "Checking Baudrate"?

This is the most common issue with the SPD Upgrade Tool and it indicates a communication failure. This is almost always caused by an incorrect driver installation or not using the correct boot key sequence. Re-install the SPD drivers and ensure you are pressing and holding the Volume Down key *before* connecting the USB cable.

Q3. My phone's IMEI is null after flashing. What can I do?

Losing the IMEI is a risk when flashing Spreadtrum devices. This firmware will not restore it. You will need a separate SPD IMEI repair tool to write your original IMEI numbers back to the device. The original numbers are printed on a sticker found under the phone's removable battery.

Advan S50A Stock Firmware (All Versions) .pac File

The Advan S50A is a 5.0-inch budget 3G smartphone from the Indonesian brand Advan, released in 2015. Running on Android 5.1 Lollipop, it served as an affordable entry-level device. If your Advan S50A is bricked, stuck in a bootloop, or suffering from other software issues, flashing the official stock firmware is the definitive way to restore it to its original factory condition.

Important Note: This device is powered by a Spreadtrum chipset. The flashing process requires the SPD Upgrade Tool and a `.pac` firmware file. Following this guide will completely erase all your personal data.

⚠️ Prerequisites: Before You Begin

Click Here for the Essential Pre-Flashing Checklist

Backup Your Data: All your files, photos, and contacts on the internal storage will be permanently deleted.
Charge The Battery: To prevent interruptions, ensure the phone’s battery has at least a 50% charge before you begin.
Windows PC & USB Cable: This procedure requires a Windows computer and the phone’s micro USB data cable.

📱 Quick Device Specifications

Device: Advan S50A
Release Year: 2015
Chipset: Spreadtrum SC7731
Display: 5.0″ FWVGA LCD (854×480)
Battery: 2000 mAh (Removable)
OS: Android 5.1 Lollipop
RAM/Storage: 1GB / 8GB

🛠 Required Tools & Downloads

File / Tool	Download Link
SPD Upgrade Tool	Download Tool
SPD SCI USB Drivers	Download Drivers

⬇️ Advan S50A Stock ROM / Firmware

Three versions are available. It is usually best to try the newest version first. If you encounter issues, try an older version.

Version	Type	Download
V01 (2015-11-24)	SPD (.pac File)	MediaFire
V1.1.6 (151412)	SPD (.pac File)	Google Drive
V1.1.4 (150606)	SPD (.pac File)	Google Drive

⚡ Quick Flashing Guide

Download and install the SPD SCI USB Drivers. Extract your chosen firmware version to get the .pac file, and extract the SPD Upgrade Tool.
Launch UpgradeDownload.exe. Click the first gear icon (Load Packet) and select the .pac firmware file.
Click the third icon, the play button (Start Downloading), to put the tool in standby mode.
Power off your phone and remove the battery. Press and hold the Volume Down button.
While holding the volume button, connect the phone to your PC. The flashing will begin. You can release the button once the progress bar appears.
Wait for the process to finish, indicated by a green “Passed” message. Disconnect the phone, re-insert the battery, and power it on.

For a more detailed, step-by-step walkthrough, please refer to our main guide:
👉 Full Tutorial: How to Flash Firmware with the SPD Upgrade Tool

❓ Frequently Asked Questions (FAQs)

Q1. There are three firmware versions available. Which one should I use?: It is generally best to start with the newest available version (the build from November 2015). If you flash it and encounter hardware-related issues like an unresponsive touchscreen or incorrect display colors, it may mean your phone is an older hardware revision. In that case, you should try flashing one of the older firmware versions.
Q2. Why is the flashing tool stuck on “Checking Baudrate”?: This is the most common issue with the SPD Upgrade Tool and it indicates a communication failure. This is almost always caused by an incorrect driver installation or not using the correct boot key sequence. Re-install the SPD drivers and ensure you are pressing and holding the Volume Down key *before* connecting the USB cable.
Q3. My phone’s IMEI is null after flashing. What can I do?: Losing the IMEI is a risk when flashing Spreadtrum devices. This firmware will not restore it. You will need a separate SPD IMEI repair tool to write your original IMEI numbers back to the device. The original numbers are printed on a sticker found under the phone’s removable battery.

🔧 Device-Specific Troubleshooting

Phone Not Detected by PC: The removable battery is helpful for troubleshooting. If the phone is not detected, the issue is almost always the VCOM drivers. Re-install them correctly on your PC. Then, click “Download” in the tool *before* connecting the phone without its battery while holding the boot key.
“Operation Failed” Error During Flashing: If the process starts but then fails, try using a different USB port (USB 2.0 is often more reliable) and a known-good data cable. The .pac file could also be corrupted, so downloading the firmware again is a good step.
Display or Touchscreen Issues After Flashing: If the flash is successful but the screen has wrong colors or the touchscreen doesn’t respond, it indicates a hardware revision mismatch. The Advan S50A was likely produced with different display components over its lifespan. Try flashing one of the other firmware versions provided in this guide.
Stuck on Advan Logo After a “Passed” Message: If the flash completes successfully but the phone won’t boot, a factory reset is necessary. Boot into recovery mode (usually by holding Power + Volume Up), and in the menu, select “wipe data/factory reset.” This will clear old data conflicts and allow the new system to boot.