Restore TP-Link MR3020 OEM Firmware
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To recover a MR3020 device to the TP-Link firmware, use the file listed below in the 
same way as an OpenWrt sysupgrade file.

Filename: tplink-mr3020.bin
MD5SUM:   0f5febac37699356b3b0b4e2d3e04903

You may install the firmware using the Firmware Upgrade page in the SECN or OpenWrt LuCI 
web interface, or copy the file to the /tmp directory on the device and install from the 
command line as folows:

  # sysupgrade -v -n <filename>

The TP-Link firmware has DHCP and WiFi AP operating by default.

SSID:   TP-LINK_POCKET_3020_53051E
P/W:    33954592
Encr:   WPA2-AES

Login:  admin
P/W:    admin

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The recovery file has been generated from the TP-Link firmware "mr3020nv1_en_3_17_2_up_boot(150921).bin"
with the boot section removed as per the OpenWrt wiki page:

    https://wiki.openwrt.org/toh/tp-link/tl-mr3020

From the wiki page:

" With the TL-MR3020 router, the stock firmware is obtained from the OEM: http://www.tplink.com/en/support/download/?model=TL-MR3020

You need to cut off parts of the image file before flashing it.
An example of an image file with the word "boot" in it is "mr3020nv1_en_3_17_2_up_boot(150921).bin"

Cut the first 0x20200 (that is 131,584 = 257*512) Bytes from original firmware.
Save the original file in a working directory, cd to that directory and execute:

     $ dd if=./mr3020nv1_en_3_17_2_up_boot(150921).bin of=tplink-mr3020.bin skip=257 bs=512
     $ md5sum tplink-mr3020.bin

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