After you flash the whole MIUI again, you can lock the bootloader.I have a M2003J15SC (China) Redmi 10X 4G and got the bootloader officially OEM unlocked last week.
Since then I have installed the latest official Xiaomi Gobal Rom, using MiFlash. The phone works fine, no problems.
Can I now safely lock the bootloader using the Fastboot command? I've seen several comments which advise against it, saying the phone will be bricked.
If the worst was to happen... and the phone IS bricked, is it something which can be fixed without taking it to a service centre or using EDL mode?
If you got bootloop, you didn't flash the WHOLE miui.
You really need to flash the full MIUI, okay?