Extroot and install luci in firmware OpenWrt Compilation

Tp-Link MR3420 v2 when viewed on the openwrt web https://openwrt.org/toh/tp-link/tl-mr3420 does not support OpenWrt 19.07.5.Only release until openwrt 17.01.7.

But by getting a modified firmware without luci and ppp, OpenWrt 19.07.5 can be installed on TP-Link MR3420 v2.4. 
The following is how to Extroot and install luci web on openwrt TP-Link MR3420 v.24 with firmware Compilation results for OpenWrt 19.07.5, TPLINK 3420 v2, USB-NET-WiFi, without LuCI, PPP.bin which can be obtained from the web in English Russia.

 Detail play Vdeo and activated feature CC/Subtitle to see detail intruction

firmware Compilation results for OpenWrt 19.07.5, TPLINK 3420 v2, USB-NET-WiFi, without LuCI, PPP.bin

- openwrt-ar71xx-tiny-tl-mr3420-v2-squashfs-factory.bin

- openwrt-ar71xx-tiny-tl-mr3420-v2-squashfs-sysupgrade.bin

firmware Link  https://bit.ly/3Bl94pB

How to download on this blog:

If the "Take Me" page appears, just click "Take Me" and follow the next instructions

Before extrooting the flash drive,we first create a partition using the Mini Partition Wizard tools.

Flashdisk (Minimum 2GB or Higher)

First primary partition:

- Create a 512MB swap partition to free up ram

Second primary partition:

- Create an ext4 partition, use all the remaining partitions to be made to ext4

Access 192.168.1.1 in the browser. No Luci yet.

Because this firmware is Non Luci and PPP

Previously, the Flashdisk that had been partitioned "sda1 Linux Swap" and "sda2 Ext4" was plugged 

into the router's usb port

find out the number of Router's default ROM

root@OpenWrt:~#df -h

To find out UUID flash

root@OpenWrt:~#block info

Example output:

/dev/mtdblock2: UUID="9fd43c61-c3f2c38f-13440ce7-53f0d42d" VERSION="4.0" MOUNT="/rom" TYPE="squashfs"

/dev/mtdblock3: MOUNT="/overlay" TYPE="jffs2"

/dev/sda2: UUID="fdacc9f1-0e0e-45ab-acee-9cb9cc8d7d49" VERSION="1.4" TYPE="ext4"

/dev/sda5: Version="1" TYPE="swap"

Run WinSCP

Access 192.168.1.1 user root password root

Find folder /etc/config/fstab

Output :

config 'global'

        option anon_swap  '0'

        option anon_mount '0'

        option auto_swap  '1'

        option auto_mount '1'

        option delay_root '5'

        option check_fs   '0'

For UUID copy your Flasdisk UUID Ext4 obtained in PuTTy when checking "block info"

/dev/sda2: UUID="fdacc9f1-0e0e-45ab-acee-9cb9cc8d7d49" VERSION="1.4" TYPE="ext4"

Change or edit like this :

config 'global'

        option anon_swap  '0'

        option anon_mount '1'

        option auto_swap  '1'

        option auto_mount '1'

        option delay_root '5'

        option check_fs   '0'

config 'swap'

        option device '/dev/sda1'

        option enabled '1'

config 'mount'

        option target '/mnt/sda2'

        option device '/dev/sda2'

        option uuid 'fdacc9f1-0e0e-45ab-acee-9cb9cc8d7d49'

        option enabled '1'

        option fs_type 'ext4'

        option options 'rw,sync'

Click SAVE and CLOSE

Open PuTTy type :

root@OpenWrt:~#block mount

root@OpenWrt:~#tar -C /overlay -cvf - . | tar -C /mnt/sda2 -xf -

root@OpenWrt:~#mkdir -p /tmp/cproot

root@OpenWrt:~#mount --bind / /tmp/cproot

root@OpenWrt:~#tar -C /tmp/cproot -cvf - . | tar -C /mnt/sda2 -x

Wait until the process is complete

root@OpenWrt:~#umount /tmp/cproot

Open WinScp find and edit /etc/config/fstab

Change or edit like this :

config 'global'

        option anon_swap  '0'

        option anon_mount '1'

        option auto_swap  '1'

        option auto_mount '1'

        option delay_root '5'

        option check_fs   '0'

config 'swap'

        option device '/dev/sda1'

        option enabled '1'

config 'mount'

        option target '/overlay'

        option device '/dev/sda2'

        option uuid 'fdacc9f1-0e0e-45ab-acee-9cb9cc8d7d49'

        option enabled '1'

        option fs_type 'ext4'

        option options 'rw,sync'

        option is_rootfs '1

SAVE AND CLOSE

Reboot Router

root@OpenWrt:~#reboot

Wait for the router to finish rebooting

Open PuTTy Access back 192.168.1.1 user root password root

root@OpenWrt:~#df -h

If the display looks like this,

EXTroot is successful,

dev/sda2/overlay matches the capacity of the previously created EXT4 partition.

Open WinScp and check folder

The /mnt/sda2 folder already exists

Install LUCI

First connect the router with an internet source

eth0 = WAN means that the router's WAN port is connected to your internet source 

so that the opkg update can run

root@OpenWrt:~#opkg update

Wait until the process is complete

Install Luci by typing

root@OpenWrt:~#opkg install luci

Wait for the Luci webui installation process to finish

The Luci installation process is complete

Open Browser access 192.168.1.1 user root password root

EXTroot capacity and install luci is appropriate