mount -o rw,remount /dev/block/platform/msm_sdcc.1/by-name/system /system
mount | grep system
/dev/block/platform/msm_sdcc.1/by-name/system /system ext4 rw,relatime,data=ordered 0 0
mount -o ro,remount /dev/block/stl12 /system
dev_mount usbdisk /storage/usbdisk auto /devices/platform/msm_hsusb_host.0
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