Yes ... You are correct!!! Boot cable is already had available in market
XIAOMI depth flash cable : bypass BootLoad locks, enter into the depth of 9008 flash mode ,then flash the phone
Press the phone ON/OFF button, When closing the phone , pls immediately press the switch of the cables about 8 seconds, , and see the computer in the device manager to recognize to port 9008, indicates success into the depth of the flash mode.
Use this , your MRT DONGLE MORE POWERFUL!!!
Have a nice day!