TL-MR6400 V4 Router | LTE (umts) wan | QMI | NO ipv4 - IP4 not working

Installing and Using OpenWrt Network and Wireless Configuration
3

Delete dslite and install 464xlat, see Unable to get Quectel EC25-E to connect in QMI mode - #21 by AndrewZ

Check if Pref64 discovery works: CLAT/464XLAT not working in 19.07.1 - #5 by AndrewZ