Open the terminal and typesudo steamos-readonly disable to enable write access on the disk, follow the above steps, use sudo steamos-readonly enable to disable them, and then switch back to gaming mode by launching Return to Gaming Mode shortcut.
Open the terminal and typesudo steamos-readonly disable to enable write access on the disk, follow the above steps, use sudo steamos-readonly enable to disable them, and then switch back to gaming mode by launching Return to Gaming Mode shortcut.