LTE not working on TL-MR6400 v5.2

Installing and Using OpenWrt
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Dear all,
I'm new to openwrt and I'm not an expert so sorry to bother you....

I need to install openwrt on a tplink TP-MR6400 v5.2 router.

I follow the instruction here https://openwrt.org/toh/tp-link/tl-mr6400_v5
and I succeded in flashing the router with

https://downloads.openwrt.org/releases/22.03.2/targets/ramips/mt76x8/openwrt-22.03.2-ramips-mt76x8-tplink_tl-mr6400-v5-squashfs-tftp-recovery.bin

and then I upgraded it with

https://downloads.openwrt.org/releases/22.03.2/targets/ramips/mt76x8/openwrt-22.03.2-ramips-mt76x8-tplink_tl-mr6400-v5-squashfs-sysupgrade.bin

Then I tried to install luci-proto-uqmi but i didn't find so I installed luci-proto-qmi; then I tried to install uqmi_2022-05-16-0.5_mipsel_24kc.ipk
but I received an answer that some dependencies are missing......anyway it seem to me that the uqmi routine is already in the original package.....so I add the following instructions to /etc/config/network...

config interface 'Broadband'
option proto 'qmi'
option device '/dev/cdc-wdm0'
option apn 'ILIAD'
option auth 'none'
option dhcp '0'
option autoconnect '1'

and in the Luci Interfaces menu the Broadband interfaces appear but it seems it is not connected to the wwan0 device and it is not working.......

Anyone can help?
Thanks

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I have the exact same problem, I know for fact that you may need to try and hook your TP link modem to wired internet to get opkg working (to get it to update the dependables/downloads list).

I have 2 modems and no wired internet ability (I live in a place where no provider would deploy their service). I tried putting the SIM card in the one with original firmware (Archer MR400), then connecting the MR6400 via WAN but I just don't get any connection.

Then I tried to share my mobile's internet through a cable (that is connected to the PC) but that didn't work either. I then tried configure the MR6400 to take wifi from my phone but that's no good too.

I would be glad if someone could help me with this case. I can in fact just switch to stock firmware. But I still want OpenWRT to get rid of bufferbloat to improve my gaming experience.