TL-MR6400 v5 - can't start LTE modem

HI! I have tl-mr6400 v5 flashed with last openWRT (OpenWrt 21.02.0-rc2) and I can't start LTE modem. It's a question to OWRT developers: why defaultly used function of router does not work, and how to set up this modem?

Does this help?

https://mega.nz/folder/9vpEHY7A#aG16hGwqwC3xcNLgAkpTIQ

Hi..

you can try my compiled... stable 21.02.0... need reboot after flashing...
let me know if it working...

Thank you

You are my hero bro, all works ! thank you