If your Xiaomi 15 is stuck on the logo screen, won’t boot, or has a corrupted IMEI after modding or failed updates—don’t panic. This step-by-step guide will show you how to flash stock firmware and, if needed, repair your IMEI safely using the right tools.

What Is Stock Firmware and Why It Matters

Stock firmware (also called ROM or flash file) is the official software preloaded by Xiaomi. It includes Android + MIUI, drivers, security patches, and hardware support for your device.

Flashing stock firmware can:

• Fix bootloops and software crashes
• Restore factory settings
• Remove bugs from failed updates or custom ROMs
• Repair IMEI/network issues (for Snapdragon variants)

When Should You Flash Xiaomi 15 Firmware?

You should flash firmware when:

• Your phone is stuck at the MIUI logo (bootloop)
• System is slow, buggy, or crashing after updates
• You rooted or unlocked and want to go back to stock
• You want to manually update or downgrade MIUI
• Your device has invalid IMEI or “No Service”
• You’re trying to unbrick the device (soft brick)

What You Need

• Correct Fastboot firmware (TGZ format) for Xiaomi 15
• A Windows PC
• Mi Flash Tool
• Original USB cable
• Xiaomi USB Drivers
• Unlocked bootloader

Flashing will erase all data. Always back up your files.
Unlock bootloader via Xiaomi’s official site

Step-by-Step Flashing Guide for Xiaomi 15

Step 1: Download the Right Firmware

• Select your region (Global, India, China, etc.)
• Download the Fastboot ROM (.tgz format)

Step 2: Install USB Drivers

Install Xiaomi USB Drivers on your PC from the above sites

These drivers ensure your PC detects the device correctly

Step 3: Install Mi Flash Tool

• Download the latest version of Mi Flash Tool
• Extract and run it as Administrator

Step 4: Enter Fastboot Mode

1. Turn off your phone
2. Hold Volume Down + Power until you see the Fastboot logo
3. Connect the phone to your PC via USB

Step 5: Load Firmware

• Extract the .tgz file twice until you get a folder with flash_all.bat
• In Mi Flash Tool, click “Select” and browse to that folder
• Choose the option:
  • Clean all (recommended) – Wipes data for a clean start

Step 6: Start Flashing

• Click “Flash”
• Wait 5–10 minutes
• You’ll see “Success” when it’s done, and the phone will reboot

Done! Your Xiaomi 15 is now running the official stock firmware.

IMEI Repair (Snapdragon Variant)

If you’re seeing “Invalid IMEI”, “No service”, or SIM not detected, your IMEI might be corrupted.

Only restore the original IMEI assigned to your device. Illegal cloning is a crime.

Method 1: QCN Restore (Snapdragon Only)

1. Use QPST/QFIL Tool
2. Backup or download your device’s QCN file
3. Enable DIAG Mode via ADB: bashCopyEditadb shell su setprop sys.usb.config diag,adb
4. Use QPST to write the QCN file

Method 2: SN Writer Tool (For MediaTek variants)

If a MediaTek variant exists for Xiaomi 15:

1. Use SN Writer Tool + DB files
2. Enter Meta Mode
3. Input your original IMEI numbers
4. Click “Start” and wait for it to finish

Common Flashing Problems & Fixe

Problem	Fix
Phone not detected	Reinstall USB drivers; try a different USB cable/port
Flash failed or stuck	Use another Mi Flash version; check firmware integrity
Bootloop after flashing	Boot into Recovery and wipe data
IMEI still invalid	Try alternative tools (Maui META, QCN restore)

Why Use Stock Firmware?

• Restores system stability
• Fixes lags and bugs
• Supports OTA updates again
• Repairs broken network functionality
• Returns phone to factory condition

Final Thoughts

Flashing firmware on the Xiaomi 15 is a reliable solution to fix major software-related problems—from boot issues to IMEI errors. Follow the steps carefully, always back up your data, and use official tools and files. With the right firmware and drivers, your device can be fully restored in less than 15 minutes.