Fixing WWAN on TP-Link MR6400 V5 under OpenWrt

README.md

If you have installed OpenWrt on your TP-Link MR6400 V5 WWAN LTE router, you would have noticed that the WWAN functionality does not work out of the box because it is not configured, functionally turning your $80 router into a $10 router.

Here is how to fix it

It is better to make a custom build and flash it, rather than messing around in the web interface and over SSH. This way, this configuration survies a factory reset.

• Head over to the OpenWrt firmware selector
• Find the exact router you have
• Press Customize installed packages and/or first boot script
• add luci-proto-qmi to Installed Packages
• and in the next field where the script goes, put the script you see bellow.

#!/bin/sh

uci set network.wwan=interface
uci set network.wwan.proto='qmi'
uci set network.wwan.device='/dev/cdc-wdm0'
uci set network.wwan.auth='none'
uci set network.wwan.pdptype='ipv4'

uci del firewall.cfg03dc81.network
uci add_list firewall.cfg03dc81.network='wan'
uci add_list firewall.cfg03dc81.network='wan6'
uci add_list firewall.cfg03dc81.network='wwan'

exit 0

Then you just request a built, and use that instead.
Additional configuration, like setting the APN may be required in the web ui. I tried to keep this script minimal.

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OpenWrt developers should strive to provide the best out of the box experience for their users, instead of defying common sense.