In TWRP: Backup > Check “EFS” > Do NOT check any other partitions > Swipe.
An is a vital safeguard for Android users who frequently modify their device's firmware, root their phones, or install custom ROMs . This compressed file contains a copy of your device's unique International Mobile Equipment Identity (IMEI) and other critical network configuration data stored in partitions like EFS , NVRAM , or Persist . imei backup zip
Without a backup, many devices become irreparable. Some phones store IMEI in read-only OTP (One-Time Programmable) memory – once corrupted, it’s gone forever. In TWRP: Backup > Check “EFS” > Do
On MediaTek devices, the key partitions include nvram , nvdata , proinfo , and protect1/protect2 . On Qualcomm devices, they are modemst1 , modemst2 , fsg , and persist . Without a backup, many devices become irreparable
Flashing custom recoveries (TWRP) or custom ROMs (LineageOS, Pixel Experience) often wipes the NVRAM or modem partitions. A backup ensures you can revert.
While generally safe, some installers may unintentionally touch critical partitions.
| Risk | Consequence | |------|-------------| | | Duplicate IMEI on network → both phones can be blacklisted or banned | | Corrupt ZIP file | Permanent IMEI loss if no other backup | | Mismatched DB version | Write fails or corrupts baseband | | IMEI cloning (legal) | Illegal in many countries (USA, UK, India, EU) |