Bueno un infarto seguro que no te va dar, pues porque nuestro querridirisisimo
VSII
no puede entar en "bootloader mode" como se explica en el paso 3 de tu guia. A saber
3-
Turn off your device. Turn it on while pressing the keys that enable the bootloader mode. Those keys are specific to your device. If you do not know which keys to press to enable bootloader mode on your device, refer to its documentation.