Fix Global Firmware Issues on Redmi Devices by Flashing cust.img (Full Guide)
If your Redmi device started acting up after flashing global firmware — missing features, no signal, or strange bugs — you’re not alone. These problems are common when switching regions or installing custom ROMs. Luckily, there’s a reliable fix that works on several popular Redmi phones and tablets.
🔍 What’s the Problem?
When users install global firmware on devices originally made for another region (like China), they often run into:
- No mobile network or “No service”
- Glitchy UI or system errors
- Missing regional features or apps
- Problems with OTA updates
Most of the time, the issue comes down to a mismatch between the firmware and the device’s regional configuration. That’s where cust.img comes in.
🧩 What is cust.img?
Think of cust.img as a customization package for Android devices. It’s a system image file that contains region-specific or carrier-specific settings, apps, and configurations. Manufacturers use it to tailor the phone experience depending on where or how the device is sold.
📦 What’s inside?
Here’s what you might find inside a cust.img file:
- Pre-installed apps (like a local music app or browser)
- Language packs
- Wallpapers, ringtones, or themes
- Network settings (for specific carriers)
- Region-based system tweaks
Flashing the proper cust.img that matches the global firmware helps:
- Enable mobile networks
- Restore missing settings and apps
- Fix update-related errors
- Improve overall stability
✅ Supported Devices
This fix has been confirmed to work on the following Xiaomi/Redmi models:
| Device Name | Codename |
|---|---|
| Redmi 12C | Earth |
| Redmi Note 12 Pro | Ruby |
| Redmi Note 12 Pro Plus | Ruby |
| Redmi 12R | Sky |
| Redmi Note 12R | Sky |
| Redmi Pad SE | XUN |
If you own one of these, and you flashed global firmware but are seeing issues, flashing the correct cust.img should fix them.
🛠 What You’ll Need
Before you begin, make sure you have:
- A Windows PC with USB drivers installed
- The correct global firmware package (fastboot version preferred)
- The cust.img file from the same firmware
- A flashing tool like MiFlash or Fastboot
- A gsmprof pass if needed (some tools require it)
🔧 How to Flash cust.img (Fastboot Method)
⚠️ Warning: This process will erase your data. Make sure to back everything up before starting.
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Download the global firmware for your device, and extract it on your PC.
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Locate the cust.img file inside the extracted folder.
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Boot your phone into Fastboot mode:
Power off the phone, then hold Power + Volume Down together. -
Connect the device to your PC via USB.
-
Open a Command Prompt in the firmware folder and enter this command:
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Wait for the flash to complete.
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Reboot the phone using:
Your phone should now boot up normally, with the correct region settings in place.
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