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[Q]How to "remount /system rw" on Android 4.2.1/CM10.1 for SSH/SFTP?

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Hallo,
i'm using SSH/SFTP for Android maintenance. On previous Android versions (4.1.2 and below) i simply used apps like 'root explorer' to remount /system to rw but starting with Android 4.2.1/CM10.1 (multi user environment) the remounted /system folder is only remounted for the app itself (root explorer) and not for any other app (including SFTP).

The only workaround i know so far is to remount the folder externally with 'adb remount' but that's a very uncomfortable solution.

Is there any solution how to remount /system rw for SSH/SFTP?
Is it possible to do an 'adb remount' from local shell?
What does 'adb remount' exactly and why does it affects all UIDs and not just one user like if done by (root) apps or local shell (mount -o remount,rw /system)?

Edit: Never mind... it must be some strange side effect with root explorer. If i use the shell command directly without ever using root explorer it seems to work. If is use a 'custom command' (mount -o remount,rw /system) in WinSCP it does work as well.

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