What is the persist partition?
Persist is partition mounted at /persist. It has ext4 file system. DRM releated files, sensor reg file (sns.reg), wifi and bluetooth mac addresses are stored there.
If you experience the following issues:
Requirements to proceed:
Setting up adb, rooting and installing drivers are not part of this guide. If you have to do that then please use @rootSU's great thread to find the guides you need.
Let's start!
You should be prompted to repair or fix errors. Keep pressing enter until the process finishes.
If you are not prompted for repair or you still have problems then follow my instructions.
Now all your problems should be gone now, but your wifi and bluetooth addresses should be fixed to prevent further problems or bugs.
Reboot your phone. All your problems should have gone now. You can delete .bdaddr and .macaddr from your sdcard.
About the other files:
SNS.reg will be regenrated, but the DRM releated files will not. Nobody ever complained about the missing DRM files, but I still want to make it possible to restore them. If anyone could make an md5 checksum about the files on the persist partition that would be great.
Persist is partition mounted at /persist. It has ext4 file system. DRM releated files, sensor reg file (sns.reg), wifi and bluetooth mac addresses are stored there.
If you experience the following issues:
- Can't access to internal storage.
- No signal even after formating cache and fastboot flash cache.img
- IMEI number is lost even after formating cache and fastboot flash cache.img
- Boot loop on Lollipop 5.0 and above
- You get "e: cannot mount /persist" in recovery
Requirements to proceed:
- Ability to use adb command.
- TWRP or Philz touch recovery.
- Universal Naked Driver for recovery. (Windows users)
- Root.
Setting up adb, rooting and installing drivers are not part of this guide. If you have to do that then please use @rootSU's great thread to find the guides you need.
Let's start!
- Reboot your phone to recovery.
- Connect USB cable.
- Open CMD or Terminal application.
- Enter following commands in CMD or Terminal application:
You should be prompted to repair or fix errors. Keep pressing enter until the process finishes.
If you are not prompted for repair or you still have problems then follow my instructions.
- Get to that point again when you entered the adb shell command then type the following command:
- Reboot your phone.
Now all your problems should be gone now, but your wifi and bluetooth addresses should be fixed to prevent further problems or bugs.
- Download this rar file.
- Extract it.
- (Linux users should enable show hidden files)
- Open .bdaddr with a hexeditor.
- You should see following:
- Change the last three 00 to something else.
- You can use 0-9 numerals and A-F letters.
- Save the modified .bdaddr.
- Open .macaddr with a hexeditor.
- You should see the following:
- Change the last three 00 to something else.
- You can use 0-9 numerals and A-F letters.
- Save the modified .macaddr.
- Copy both files to your sdcard.
- Enable USB debugging on the phone.
- Open CMD or Terminal application. (If you closed it)
- Enter following commands in CMD or Terminal application:
- Grant access on the phone.
Reboot your phone. All your problems should have gone now. You can delete .bdaddr and .macaddr from your sdcard.
About the other files:
SNS.reg will be regenrated, but the DRM releated files will not. Nobody ever complained about the missing DRM files, but I still want to make it possible to restore them. If anyone could make an md5 checksum about the files on the persist partition that would be great.
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