@garban 

if you have pc with old  win 10 v1803 and lower then try on it

also only difference from stock windows on my pc is SMB 1.0 client enabled and enabled NetBIOS over TCP/IP (but i cannot figure out how it may affect in this case)

do not use any usb hubs extenders adaptors and other stuff - only direct connection with good cable 

I performed my upgrade only with old win version and multiple (5 or 6) attempts, as i remember sequence then plug cable,  router state (on off), software runned or not really matters,  try all combos

  @Evg79 

I installed Qualcomm HS USB drivers and managed to make it show connected in the app. It managed to flash MP but does not proceed to flash AP. I get "Fail to get fastboot handle" 

Did you install any drivers?

  @Evg79 Can you send the beta firmware and the software to upgrade called "programtool-simplify v 1.0.4" on my email arjz@live.fr please thanks

  @garban 

no, I did not install  any drivers 

  @Evg79 

This is strange then. Because it means windows installed drivers. Can you tell me how is the m7650 recognised in com ports in your pc?

  @garban 

sorry but i already moved on next firmware version

but as  i remember programtool listen specific port then actually change device composition mode via adb command at this moment device manager in windows  shows modem (but as i remember only as one device) so i think you can try to remove qualcomm drivers to check their influence 

  @Evg79 , @garban , could you send program tool and beta firmware to update my M7650 thanks

  @TP-Link Hello. My current firmware version is: "1.1.6 Build 180723 Rel.1022n" and i'd like to upgrade to "M7650(EU) 1.1_1.1.9 Build 220418 Rel.1027n_User", but i get the usual error.

Can you send me the beta file please?