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# OpenWRT for TP-Link MR200v1
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**Follow all steps at own risk!**
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Before downloading anything, consider reading the blog post:
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<https://peterbabic.dev/blog/how-verify-openwrt-integrity-files>
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## Recovery image preparation
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The recovery image is used to replace the stock firmware with OpenWRT via
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TFTP. Citing the MR200 OpenWRT
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[manual](https://openwrt.org/toh/tp-link/archer-mr200):
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> Turn on the device while pushing the WPS button until the WPS light turns
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> on. At that point, the bootloaders integrated tftp client with the ip
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> address of 192.168.1.1, tries to connect to a tftp server running at
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> address 192.168.0.66 and getting the file named
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> **ArcherC2V1_tp_recovery.bin**. so you need to be running a tftp server
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> with the ip/netmask of 192.168.0.66/23 and connect it to lan port1. It is
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> vital that your firmware includes the bootloader at the very beginning
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> (without any extra tp-link header) as the bootloader will start writing
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> the firmware to flash with the starting address of 0x00000000.
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Manual recovery image preparation:
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```bash
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cd firmware
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dd bs=512 obs=512 skip=1 count=256 if=Archer\ MR200v1_0.9.1_1.2_up_boot_v004a.0\ Build\ 180502\ Rel.53881n.bin of=ArcherMR200_bootloader.bin
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cat ArcherMR200_bootloader.bin openwrt-19.07.6-ramips-mt7620-ArcherMR200-squashfs-sysupgrade.bin > ArcherC2V1_tp_recovery.bin
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```
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Manual recovery image upload using TFTP:
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```bash
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sudo pacman -S atftp
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sudo mkdir -p /srv/atftp
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sudo cp firmware/ArcherC2V1_tp_recovery.bin /srv/atftp
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sudo chown -R atftp:atftp /srv/atftp
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sudo ifconfig enp0s31f6 192.168.0.66/23
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sudo systemctl start atftpd.service
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# Optionally test TFTP server is working properly
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#curl -O tftp:/192.168.0.66/ArcherC2V1_tp_recovery.bin
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```
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## Revert to TP-Link stock firmware
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**Important:** Always revert back to the same version in which you switched
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from.
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```bash
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cd firmware
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dd bs=512 obs=512 skip=257 count=15744 if=Archer\ MR200v1_0.9.1_1.2_up_boot_v004a.0\ Build\ 180502\ Rel.53881n.bin of=extracted_firmware.bin
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scp extracted_firmware.bin root@openwrt:/tmp
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/usr/bin/ssh root@openwrt
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mtd -r write extracted_firmware.bin firmware
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```
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## 4G signal LED integration
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OpenWRT does not enable working LED's for 4G signal by default. Manual
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method:
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```bash
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cd files
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scp -r root etc root@openwrt:/
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/usr/bin/ssh root@openwrt
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opkg update
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opkg install curl
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reboot
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```
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## Custom image with built in LED signal integration
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Manual custom image build steps:
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```bash
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pacman -S --needed base-devel ncurses zlib gawk git gettext openssl libxslt wget unzip python
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wget https://downloads.openwrt.org/snapshots/targets/ramips/mt7620/openwrt-imagebuilder-ramips-mt7620.Linux-x86_64.tar.xz
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tar xJf openwrt-imagebuilder-ramips-mt7620.Linux-x86_64.tar.xz
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cd openwrt-imagebuilder-ramips-mt7620.Linux-x86_64
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ln -s ../files .
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make image PROFILE=tplink_archer-mr200 PACKAGES="curl" FILES=files/
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```
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The sysupgrade file is available at
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`openwrt-imagebuilder-ramips-mt7620.Linux-x86_64/bin/targets/ramips/mt7620/openwrt-ramips-mt7620-tplink_archer-mr200-squashfs-sysupgrade.bin`
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after the build and includes `curl` and the LED script.
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Alternatively, the steps are automated in a [build.sh](./build.sh) script.
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After running, the custom image file is conveniently symlinked to `mt7620`.
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## Credit
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The authors of the LED script are users **asenac** and **spamcop**,
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published ad OpenWRT
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[forum](https://forum.openwrt.org/t/signal-strength-and-4g-leds-on-tp-link-mr200/65978)
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