Solved ..
Well.. this is embarrassing,   after rebooting the computer one more time, the Qualcomm drivers appaired. Went on to successfully install the original android 10 (ver 10.5.8) (metro-t-mobile ver)
then installed -  "Metro - to- Global", preassembled package image of  oxogen OS ver 10.5.5 .. ( no trace of  Metor-T-Mobil anymore)
Then tried to flash EU firmware OxygenOS_10.5.2 . Then Global OxygenOS_10.5.3  as required for UT install..  both of theas attempts failed.   MSM download tool error: "Device not match image (20880)"
Thanks for your info Wally, Id sure like to hear what Ruben did, ?  is OS ver 10.5.3 OR 10.5.2 an absolute must to install UT .. ?
Thanks again