Download the official (ensure it is the "Fastboot" version, ending in .tgz ). Install Xiaomi USB Drivers on your PC. Entering Fastboot Mode : Turn off the phone.
Don’t panic. In 99% of cases, a bricked REDMI 14C is fixable. Unless you dropped it in the ocean or ran it over with a car, you likely have a software brick —not a hardware one. How to Unbrick REDMI 14C