Avoid $5 cables from unknown sellers. Spend $25 on a cable with the "FTDI FT232RL" chipset. These are stable and won't disconnect mid-flash.
Obtain legitimate software
E-Sys Plus is a Chinese-developed launcher known for its speed and extra features . Version 4.0.2 specifically added support for newer vehicle mappings and integrated tools that aren't in the standard E-Sys .