Xiaomi Qin 1s+ Stock Firmware PAC ROM (Official Flash File) v2.2.1 (8GB Edition)

About Xiaomi Qin 1s+ Stock Firmware

Xiaomi Qin 1s+ Firmware (also marketed as Xiaomi Qin 1s Plus) is the official factory stock firmware released by Duoqin (Xiaomi ecosystem) for the popular 4G smart keypad phone Xiaomi Qin 1s+ (powered by the Unisoc / Spreadtrum SC9820E dual-core chipset with 8GB internal storage). Packaged in the industry-standard .PAC firmware container format, this package serves as the primary factory image used to restore the phone to its original factory state, resolve bootloop issues, and recover from deep software faults.

This firmware build is highly sought after within the enthusiast and repair communities due to its excellent system stability, clean environment, and open compatibility for sideloading third-party Android APK applications onto the Mocor 5 platform.

Key Features & Highlights

• Device Unbricking & Restoration: Resolves bootloops, frozen startup screens, white screens, soft bricks, or corrupted partitions after flashing experimental files back to original factory condition.
• 8GB Hardware Revision Optimization: Perfectly tailored to the storage partition geometry of the Qin 1s+ 8GB ROM variant.
• APK Sideloading Compatibility: Provides the optimal software foundation for installing compatible Android APK tools and messaging utilities on a 2.8-inch display with physical keypad navigation.
• Unified Spreadtrum PAC Container: Single-click loading into official flashing tools like ResearchDownload or UpgradeDownload.
• Full Hardware Integration: Guaranteed compatibility with the USB Type-C interface, IR remote blaster, 4G VoLTE connectivity, and Wi-Fi hotspot sharing.

Safety Precautions

Warning: Flashing a PAC image will format internal storage and wipe all personal user data. Maintain default backup calibration settings in ResearchDownload to safeguard your device NVRAM parameters, Baseband calibrations, and factory IMEI identifiers.

Flashing Guide via ResearchDownload Tool

1. Download the Xiaomi Qin 1s+ Firmware archive from LinkSave.net and extract the .PAC file on your computer.
2. Ensure Unisoc / Spreadtrum USB drivers are properly installed on your Windows PC.
3. Run ResearchDownload.exe (or UpgradeDownload.exe) as Administrator.
4. Click the single gear icon (Load Packet) and select the extracted .PAC file.
5. Click the Start Downloading (Play) button.
6. Power off your Xiaomi Qin 1s+ completely, hold the # key (or * key depending on build revision), and connect the USB cable to the PC.
7. When flashing begins, release the key and wait for the green Passed notification. Disconnect the USB cable and power on your phone.