my redmi k50 ultra does not appear on PC in fastboot mode after installing chinese ROM

[cleberfera]

I needed to reinstall the original China Hyperos ROM on my Redmi K50 Ultra to be able to relock the bootloader, since WhatsApp no longer allowed installation on devices with an unlocked bootloader. I installed the stock ROM 1.0.7.0.ULFCNXM and after that my cell phone was no longer recognized in fastboot mode on the PC, it doesn't even appear in the device manager with any driver error. It's as if in fastboot mode the device was not even connected to the PC. Please someone help me.