IMEI repair after flashing: tools and the rules that matter
1 min read
IMEI repair means restoring the phone's own number after a firmware failure, not replacing it. This guide covers phones that show a null or zero IMEI after flashing.
Why the IMEI gets lost
- A full flash that wiped EFS or NVRAM.
- Bootloader unlock or region change errors.
- Physical memory damage, which needs board diagnostics.
Workflow
- Find the original IMEI.
- Check for an EFS or NVRAM backup.
- Identify the chipset and connection mode.
- Pick a tool that lists IMEI repair for the model.
- Verify with *#06# and network registration.
Typical tools
| Platform | Mode | Tools |
|---|---|---|
| Qualcomm | Diag / EDL | UnlockTool rental, TSM Tool Pro rental |
| MediaTek | BROM / Meta | UnlockTool rental, Android Multi Tool rental |
| Unisoc | Diag / SPD | UnlockTool rental, Android Multi Tool rental |
If the modem or memory chip is damaged, software repair will not help and the board needs a hardware check.
FAQ
Can I change an IMEI?
No. Changing an IMEI to a different number is illegal in many countries. Only restoring the device's original IMEI is legitimate.
Where is the original IMEI?
On the box, the SIM tray, a label under the battery or the purchase documents.
Why does the IMEI disappear?
Usually a damaged EFS (Qualcomm) or NVRAM (MediaTek) partition after flashing.
Does a backup help?
Yes. Restoring your own EFS or NVRAM backup is the most reliable fix.
Which tools support IMEI repair?
UnlockTool, TSM Tool Pro and Android Multi Tool, on supported models.
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