[Help] How to access fastboot?

dear all,

yesterday i was tried to installing new rom via edl
everything works perfectly untill flashing,
because MiFlash the time look 10000s.,

and now myKenzo Complety Dead then i Can't Access Fastboot mode
but on device manager in my computer the driver Qualcomm HS-USB Diagnostics 900E is Read
when kenzo connecting to my computer.

so, anyone can help me to fix this (how to access fastboot)
im really confusing right now...

many thanks