(my english is not good) I have a problem. On the b20 band, the cell information location positioning it not working on my Redmi Note 4x phone. The gps is fine. Example. So apps like Xwidget is not working because its serving false data. I used LTE discovery, for troble shooting. This problem has occoured since mid-late january. I tired all the xiaomi.eu rom from 2017 dec- 2018.february but it not solved my problem. So i tried two custom oreo rom (pixel experience, crd), that sloved this issue, but i had to go back miui, because the mi sound enhacer. With mi flash, i flashed the beta, and global rom with clean all, but that not worked. Some folk recomended, to update the modem driver. How do i do that ?