Note on Bootloader Unlock: If you previously unlocked your bootloader, the flash process might fail if you use a "clean all and lock" option. Always use the standard "clean all" option when trying to recover a bricked device.
First, identify what you’re dealing with:
Do you see the Fastboot bunny?
Is Mi Flash asking for authorization?
Nothing works?
Important: If Mi Flash gives an error "Cannot receive hello packet," you need an Authorized Mi Account (see below).
This is the most important section. If your REDMI 14C is a dead brick (no logo, no vibration, no recovery), you need EDL Mode.