M-Horse R9S Firmware Flash File Download [Stock Rom]

The M-Horse R9S is a budget Android device based on the Spreadtrum SP7731 chipset. Like many phones in this category, it’s susceptible to a range of software problems that can render it unusable. Specific user-reported issues include the phone getting stuck in a bootloop, being infected with pre-installed malware or “sexual apps,” and becoming completely unresponsive (bricked) after failed software modifications.

When a phone is stuck in a bootloop or compromised by malware that a simple factory reset can’t remove, the only reliable solution is a full firmware reinstallation. This guide provides the official stock ROM for the M-Horse R9S, which is a .pac file designed to be flashed using the SPD Upgrade Tool (also known as ResearchDownload).

M-Horse R9S Firmware Details

Below are the technical specifications for the M-Horse R9S firmware. This package will restore the phone to its factory Android 5.1 software. Flashing must be done using the SPD Upgrade Tool.

Download Official Firmware for M-Horse R9S

This is the official V1 factory firmware for the M-Horse R9S. You may need to locate the .pac file within the archive after extracting it.

• Build: V1
  • File Name: M_Horse_R9S_5.1.zip
  • Size: 472MB
  • 🔗 Download Link: Download (MediaFire)

Why Flash This Specific Firmware?

Flashing the official stock ROM provides direct solutions to real-world problems reported by users of M-Horse and similar Spreadtrum devices:

• Fix the “Wi-Fi Bootloop” Issue: A bizarre and frustrating bug reported on some Android devices is the phone entering a bootloop the moment it connects to a Wi-Fi network. This is caused by a corruption in the networking services or drivers. A full firmware flash with this ROM is the only way to replace these damaged system-level components and restore stable Wi-Fi connectivity.
• Remove Stubborn Malware and “Sexual Apps”: Some budget phones have been known to come with pre-installed malware or adware that automatically installs unwanted apps (sometimes referred to as “sexual apps”). Because these are injected into the system partition, a factory reset won’t remove them. Flashing this clean, official firmware is the only guaranteed way to completely wipe the device and remove all traces of such infections.
• Solve “Hang on Logo” After Factory Reset: If you perform a factory reset but the phone still gets stuck on the M-Horse logo, it can be a sign of a more serious issue with the internal storage (eMMC). Before assuming it’s a hardware failure, flashing this official PAC file is the last and best software-level step to rule out a simple partition corruption.

Crucial Prerequisites Before Flashing

This process will erase all data. Back up your files if possible.

• The latest version of the SPD Upgrade Tool.
• The correct Spreadtrum USB drivers installed on your Windows PC.

How to Flash the Firmware

This is a Spreadtrum device and must be flashed with the SPD Upgrade Tool by loading the .pac file.

1. Download and extract the firmware file (M_Horse_R9S_5.1.zip) to find the .pac file inside.
2. Install the Spreadtrum drivers on your PC.
3. Launch the SPD Upgrade Tool, click the gear icon (‘Load packet’), and select the firmware’s .pac file.
4. Click the ‘Start downloading’ (Play) button to put the tool into standby mode.
5. Power off your phone completely. Press and hold the Volume Down key, then connect it to the PC with a USB cable to begin flashing.

For a complete, step-by-step tutorial with screenshots, please follow our master guide:

→ How to Use the SPD Upgrade Tool to Flash Your Smartphone

Disclaimer: Flashing a Spreadtrum device carries inherent risks. Using the wrong firmware or an interruption during the process can permanently brick your phone. We are not responsible for any damage or data loss. Proceed with extreme caution.