If your Redmi A3 is stuck on the boot screen, showing “Invalid IMEI”, or not detecting SIM/network, you can fix it by flashing official firmware and restoring IMEI using MediaTek tools.

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📱 What Is Stock Firmware?

Stock firmware (Scatter ROM) is the official Xiaomi system software. Flashing it can:

• Fix bootloop or stuck logo issues
• Restore corrupted system partitions
• Remove root, Magisk, or custom ROMs
• Repair IMEI and network issues
• Improve performance and stability

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🚨 When to Flash Redmi A3

You should flash the device if:

• Stuck on MI logo or bootloop
• IMEI is missing or invalid
• No mobile network or SIM not detected
• You want to remove root or custom ROM
• You want to downgrade to a previous version

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✅ What You Need

• ✅ Official firmware (Scatter ROM) for Redmi A3
• ✅ SP Flash Tool (Smart Phone Flash Tool)
• ✅ MediaTek USB VCOM drivers
• ✅ Windows PC + USB-C cable
• ✅ Unlocked bootloader
• ✅ Full backup of data and IMEI (QCN/NVRAM)

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🔧 Flashing Firmware – Redmi A3 (Step-by-Step)

Step 1: Download ROM

• Get the official Redmi A3 Scatter ROM (MTK_scatter.txt inside)
• Extract it — check for MTXXXX_Android_scatter.txt in the folder

Step 2: Install Tools & Drivers

• Install MediaTek VCOM USB drivers
• Download and open SP Flash Tool

Step 3: Load Firmware in SP Flash Tool

• In SP Flash Tool:
  • Click Scatter-loading → select the MT*_Android_scatter.txt
  • Select Download Only mode
  • Uncheck preloader if you’re unsure (to avoid hard brick)

Step 4: Connect and Flash

• Power off the phone
• Click Download in SP Flash Tool
• Connect phone via USB
• Wait for flashing to complete (3–5 minutes)
• A green “Download OK” message will appear
• Disconnect and reboot the device

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📶 How to Repair IMEI on Redmi A3

Redmi A3 runs on MediaTek Helio G36, so IMEI repair is done via Maui META or Modem Meta tools.

⚠️ Only restore the original IMEI printed on the SIM tray or box. Using fake or random IMEI is illegal.

🔧 IMEI Repair Tools:

• Maui META or Modem META
• AP_DB and MD1_DB files (from firmware)

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🛠 IMEI Repair with Maui META

1. Install Drivers
   • Install MediaTek USB VCOM drivers
2. Run Maui META
   • Set connection mode to “IMEI Download”
   • It will wait for device in META mode
3. Connect Phone
   • Power off the phone
   • Connect USB — phone should be detected in META mode
4. Load DB Files
   • Use AP_DB and MD1_DB from your ROM package
   • Load into Maui META
5. Write IMEI
   • Go to IMEI Download tab
   • Enter original IMEI
   • Click Download to Flash
6. Reboot & Confirm
   • Restart phone
   • Dial *#06# to confirm IMEI is restored

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🔄 Common Errors & Fixes

Problem	Solution
Phone not detected	Reinstall drivers / use different USB port
SP Flash error	Try another SP Flash Tool version / uncheck preloader
IMEI not restoring	Use correct DB files / try Modem META
Bootloop after flash	Boot to Recovery > Wipe data/factory reset

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🔐 Flashing Tips

• Always back up IMEI/NVRAM before flashing
• Avoid flashing preloader unless required
• Confirm firmware matches Redmi A3 (India or Global)
• Use only official firmware and tools
• Ensure battery is at least 50% charged