[FS#146] wndr 3700v4 and 4300v1 couldn't effectively use 128 nand flash space

[LEDE Bugs]

The following task has a new comment added:

FS#146 - wndr 3700v4 and 4300v1 couldn't effectively use 128 nand flash space
User who did this - Simpy (Cutepally)

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source: IcyK ( https://forum.openwrt.org/viewtopic.php?pid=223037#p223037 )

**THIS SHOULD ONLY BE USED AT YOUR OWN RISK**

**IF YOU DONT KNOW WHAT YOU ARE DOING STOP NOW**

you can try to backup mtdblock11 to your USB storage (this didn't work for me, some IO error)

  * dd if=/dev/mtdblock11 of=/mnt/usb1/Downloads/mtdblock11.backup

first temporarily mount mtdblock11 somewhere /mnt/mtdblock11 for instance
  * mount -t jffs2 /dev/mtdblock11 /mnt/mtdblock11

then copy everything from /overlay to /mnt/mtdblock11

  * tar -C /overlay -cvf - . | tar -C /mnt/mtdblock11 -xf -

then add the folowing before exit 0 in your /etc/rc.local

  * umount /overlay
  * sleep 5
  * mount -t jffs2 /dev/mtdblock11 /overlay

then reboot
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=146#comment1679