Question Bootloader can be locked? - Redmi Note 10

Can the bootloader be locked after a custom rom or a root, well if the stock rom and stuff is flashed again can it be locked?

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Compec said:
Can the bootloader be locked after a custom rom or a root, well if the stock rom and stuff is flashed again can it be locked?
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The answer is a bit complicated.
To lock the bootloader, a root of trust must be set - whereas a cryptographic key is installed, as well as a verification hash against which the boot image and system image may be checked for their integrity. This is always the case with factory firmware, but only some ROM developers have gone this far.
I am not sure if it is possible to lock the bootloader if the firmware is untrusted. If it is, one of 2 things will likely happen.
The device may fail to boot, and display this message:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Or, it may boot, but display this message:
If however a custom root of trust has been set, the device will boot with this notice:
Ultimately, my advice is this: Do not try to lock the bootloader on anything other than OEM firmware, unless the developer of a custom ROM explicitly affirms that the device can be locked when using that firmware.