Common causes of NVRAM corruption:
Symptoms of NVRAM corruption:
- IMEI: 000000000000000 / null
- Wi-Fi MAC: 00:00:00:00:00:00
- "Invalid IMEI" in Engineering Mode
- No SIM card detection
Recovery path:
Modifying IMEI is illegal in many countries (US, EU, India, China). This guide is intended for legitimate backup/restore and repair of your own device using your own original data. Do not copy or clone NVRAM from another device. mt6768 nvram file
Here’s a technical write-up on the MT6768 NVRAM file, covering its purpose, structure, typical usage, and common repair/replacement procedures.
Restoring the NVRAM alone may not restore your original IMEIs if the backup was blank. To write IMEI properly:
Using SN Writer (MediaTek official tool): Common causes of NVRAM corruption:
Using Maui META Tool:
This will change IMEI (illegal in many regions). Proceed only for repair with your own original backup.
# Flash back your backup
fastboot flash nvram nvram_backup.img
fastboot flash nvdata nvdata_backup.img
| Tool | Purpose |
|------|---------|
| SP Flash Tool | Backup/restore full NVRAM partition |
| Maui META 3G/4G | Write IMEI, restore MAC addresses |
| SN Writer Tool | Official MediaTek tool for writing serials (IMEI, BT, Wi-Fi) |
| HxD / hex editor | Manual editing (advanced users, checksum aware) |
| MTK Droid Tools | Older chipset support – limited on MT6768 |
| Python scripts (e.g., mtk_nvram.py) | Parse, extract, repack NVRAM binary | Symptoms of NVRAM corruption: - IMEI: 000000000000000 /
Warning: Never download random NVRAM files from untrusted sources. Using another device’s NVRAM will copy that device’s IMEI, which is illegal in most countries (IMEI cloning). It will also cause RF calibration mismatches, leading to poor signal or battery drain.
However, if you need a "generic" or "blank" MT6768 NVRAM file for repair purposes (to later write your own IMEI using Maui META or SN Writer), consider these sources:
Before downloading, verify that the file header matches MT6768. Open the file in a hex editor (like HxD). You should see strings like NVRAM, MT6768, or board IDs.
NVRAM stands for Non-Volatile Random Access Memory. Unlike standard RAM that clears when power is off, NVRAM retains data after shutdown. On an MT6768 chipset, the NVRAM file (often stored as nvram.bin or nvdata.img) is a partition on the phone’s EMMC storage.