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Old 10-11-16, 04:53 PM   #3
Ka N oK
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Default Re: [OnePlus 3] How to Unlock Bootloader, Flash TWRP, Root, OS

5. Making an EFS Backup

All too often, we've seen folks who have a corrupted or missing EFS Partition. This results in your IMEI being lost and no cellular activity on the device at all. This can be a royal PITA to fix, and some folks haven't been able to fix it at all. You can take a precautionary measure to safeguard yourself against this by taking a couple of minutes to back up your modemst files.

1. Open up Terminal Emulator on your phone (if you don't have it you can download it here).
2. Once it's open you'll be greeted with a command line prompt, in which you can enter text commands, the first thing you need to do is enable root access by entering this line (press the enter key on your on-screen keyboard after each command to issue it):
If this is the first time you've used Terminal Emulator a Superuser or SuperSU popup will appear, make sure you grant root access.

3.Now enter these two commands:
dd if=/dev/block/sdf1 of=/sdcard/modemst1.bin bs=512

dd if=/dev/block/sdf2 of=/sdcard/modemst2.bin bs=512

This will place two files (modemst1.bin & modemst2.bin) on your internal storage. Make sure you copy them to your PC and other Clouds immediately so that you have a backup there to use if you need to restore it in future.

That's it !! Incase you ever need to restore Nanroid or EFS Backups, continue.

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