Question: how to flash lg e739?
Answer: Install phone drivers (reboot might be required after to get them to recognize the phone)
Install msxml. ... 
Open KDZ_FW_UPD.exe.
"Type" choose 3GQCT.
Choose in "Phonemode": Emergency.
Click the folder icon and choose the kdz file that UpTestEX_mod2_marwin.exe just made.