Having null IMEI, baseband unknown, or no network signal on your Huawei device? This comprehensive guide explains the causes, symptoms, and solutions for IMEI-related issues on Huawei devices with Kirin and Qualcomm chipsets.
IMEI repair should only be performed on devices with corrupted or lost original IMEI. Changing IMEI to a different number is illegal in most countries.
What is IMEI?
IMEI (International Mobile Equipment Identity) is a unique 15-digit number that identifies your mobile device. It's stored in the device's NVRAM partition and is essential for:
- Network registration and connectivity
- Device identification by carriers
- Warranty and service verification
- Anti-theft tracking
You can check your IMEI by dialing *#06# on your phone.
Symptoms of IMEI Problems
No Signal
Device shows no network bars or "Emergency calls only"
Baseband Unknown
Settings shows "Baseband version: unknown"
SIM Not Detected
Device doesn't recognize inserted SIM card
Common Causes of IMEI Loss
1. Failed Firmware Flash
Interrupted or incorrect firmware flashing can corrupt the NVRAM partition where IMEI is stored. This commonly happens when:
- Flashing wrong firmware version
- Power loss during flash process
- USB cable disconnection
- Using incompatible flash tools
2. Improper Downgrade
Downgrading firmware without proper procedure can wipe the NVRAM partition, resulting in IMEI loss.
3. Water or Physical Damage
Water damage or physical shock can corrupt the NVRAM chip, causing IMEI data loss.
4. Factory Reset Issues
On some devices, performing factory reset through certain methods can accidentally wipe IMEI data.
IMEI Repair Methods
Method 1: Server-Based Repair (Recommended)
This is the safest and most reliable method for Huawei devices. It works by:
- Reading device information via special tools
- Requesting IMEI data from secure servers
- Writing the original IMEI back to NVRAM
- Rebuilding baseband configuration
Server-based repair has 95% success rate on Kirin 710, 810, 820, 980, 990, and 9000 devices.
Method 2: NVRAM Backup Restore
If you have a previous NVRAM backup, IMEI can be restored by:
- Booting device to download mode
- Connecting via compatible tool
- Writing NVRAM backup to device
Note: This requires having a backup made before the issue occurred.
Method 3: Hardware Repair
In cases of physical damage, the NVRAM chip may need:
- Chip reballing
- NVRAM chip replacement
- Board-level repair
Supported Devices for IMEI Repair
| Chipset | Models | Success Rate |
|---|---|---|
| Kirin 9000 | Mate 40 Pro, P50 Pro | 90% |
| Kirin 990 | P40 Pro, P40, Mate 30 Pro | 95% |
| Kirin 980 | P30 Pro, P30, Mate 20 Pro | 95% |
| Kirin 710 | P30 Lite, Nova 4e | 98% |
| Qualcomm | Various Honor/Huawei models | 85% |
| SPD/Unisoc | Budget Huawei models | 90% |
Our IMEI Repair Service
AOS Unlocker provides professional IMEI repair service with:
- Remote Service - No need to send your device
- Fast Turnaround - Most repairs done in 2-6 hours
- High Success Rate - 95% average success
- Money-Back Guarantee - Full refund if repair fails
Do NOT attempt IMEI repair using free tools or tutorials without proper knowledge. Incorrect procedures can permanently damage your device's baseband.
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Prevention Tips
To avoid IMEI issues in the future:
- Always backup NVRAM before any firmware operations
- Use correct firmware matching your exact device model
- Avoid interrupting flash or update processes
- Use reliable power source during flashing
- Seek professional help for complex operations