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Remount system as Read/Write
For remounting, we need to use the alt-f1 console or built in terminal.
For Bliss 14.x:
Open the built in terminal app, then enter:
su mount -o remount,rw /system
For Bliss 12.x:
Use the alt-f1/f7 console, then enter:
mount -o remount,rw -t ext4 /dev/loop0 /
For Bliss 11:
Use the alt-f1/f7 console, then enter:
mount -o remount,rw -t ext4 /dev/loop0 /system
After that is done, you can edit the system files you need. When you are done, you can close the terminal app or use alt-f7 to get back to Android if you are using the Console.