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I rooted my Sony Xperia E3 (D2203) a while ago using Kingroot, which worked flawlessly. Before rooting my device, /system could be accessed, which is how root was installed in the first place.

However after rebooting the phone, I now cannot mount /system as rw, as the kernel mounts it as Read-Only and gives me a Operation not permitted error whenever I try to remount it as rw. Apparently the kernel on Sony devices detects root and mounts /system as Read-Only.

I cannot flash a new recovery as the bootloader is permanently locked.

What can I do to mount /system at startup as rw, or mount /system when the device is online?

A non-destructive method would be great.

Here is the command I'm using to try and mount /system:

mount -o remount,rw /system

Yes, the terminal is in root mode.

  • mount -o remount,rw /system – MoonRunestar Oct 17 '15 at 12:05
  • I've noticed someone say that mount -o rw,remount /proc /system could work. Would this work? – MoonRunestar Oct 17 '15 at 12:08
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    Why should it? If /proc were mounted r/o, many processes would fail (so it's obviously mounted r/w already). So no difference to your previous approach. I rather assume there's some SE_Linux safeguard actively preventing the command – but as I've never played with that, I cannot give any hints on how to deal with that. – Izzy Oct 17 '15 at 12:26
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Using Total Commander to remount the / directory as RW also remounted /system as RW.

Howto:

  1. Enable Root Functions Everywhere in TC settings.
  2. Proceed to add a new button to the toolbar with Function Type Internal Command.
  3. Press on the >> button, and select the 119 Remount option.
  4. Press OK/Apply
  5. Navigate to root (/) directory.
  6. Press newly created Remount button and accept any prompts.

Edit: I've found that when I'm using Kingroot to manage root, mounting works correctly. When I migrated over to SuperSU however, I could not remount / or /system as RW. If the above steps don't work for you, Kingroot might be worth a shot.

Another edit: While I do recommend Kingroot as an option to allow access to your /system folder, you should exercise caution with Kingroot, as it is known to gather information about your device. I would save Kingroot to be a last resort, should you cannot find any other method of remounting /system as rw successfully.

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    Could you add some details on how to remount drives using Total Commander? Also, a link to the app is encouraged, which has been provided. – Tamoghna Chowdhury Nov 25 '15 at 4:24

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