Q1. Why is the flashing tool stuck at the "Checking Baudrate" step?

This is the most common issue when using the SPD Upgrade Tool. It indicates a communication failure, 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.

Q2. Can I use this firmware to upgrade my Advan S45E to a newer Android version?

No. This is the official Android 6.0 Marshmallow firmware, which was the final OS version officially released for the Advan S45E. No official updates to newer Android versions are available.

Q3. My phone's IMEI is null after flashing. How can I fix it?

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 S45E Stock Firmware (.pac File for SPD Tool)

The Advan S45E is a compact, 4.5-inch 3G smartphone from the Indonesian brand Advan, released around 2017. Running on Android 6.0 Marshmallow, it was designed as an ultra-affordable device for basic communication. If your Advan S45E is bricked, stuck in a bootloop, or has become unusable due to software errors, flashing the official stock firmware is the definitive method to restore it to its original factory state.

Important Note: This device is powered by a Spreadtrum (now UNISOC) 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 S45E
Release Year: ~2017
Chipset: Spreadtrum SC7731C
Display: 4.5″ FWVGA LCD (854×480)
Battery: 1700 mAh (Removable)
OS: Android 6.0 Marshmallow
RAM/Storage: 1GB / 8GB

🛠 Required Tools & Downloads

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

⬇️ Advan S45E Stock ROM / Firmware

Model	Android	Chipset	Type	Download	Size
S45E	6.0 Marshmallow	Spreadtrum SC7731C	SPD (.pac File)	MediaFire	649 MB

⚡ Quick Flashing Guide

Download and install the SPD SCI USB Drivers. Extract the firmware (Advan_S45E...SPD.zip) 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 you extracted.
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. Why is the flashing tool stuck at the “Checking Baudrate” step?: This is the most common issue when using the SPD Upgrade Tool. It indicates a communication failure, 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.
Q2. Can I use this firmware to upgrade my Advan S45E to a newer Android version?: No. This is the official Android 6.0 Marshmallow firmware, which was the final OS version officially released for the Advan S45E. No official updates to newer Android versions are available.
Q3. My phone’s IMEI is null after flashing. How can I fix it?: 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 S45E may have been produced with different display components over its lifespan. This firmware is the standard version, but in rare cases, a different build might be needed if you face such issues.
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.