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adb shell   su   mount -o rw,remount -t ext4 /system

Edit: Found a better solution

From host machine(Linux or windows PC), execute the following commands.

>> adb root  >> adb remount

remount will by default remount the /system partition with rw, if you have the permissions.

Note 1: To do su or adb root, your device must be rooted and have su executable on it. When you do an su, if it is executed properly, your terminal prompt will change from $ to #. Thanks..

Note 2: In recent mobiles, few of acer and samsung that i know, Security has been tightened, and even after rooting the phone, adb remount wouldn't work. As of i know, there is no solution available for it so far.

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