hello plz help redmi 12 5G qualcomm installed android 14 successfully…

hello plz help redmi 12 5G qualcomm installed android 14 successfully with miflash tool when reboot it only reboots to recovery 5 minutes and it only boot to fastboot someone tell me to unlock bootloader and it will boot normally how i do unlock bootloader plz help what tool should i rent now to do that, thanks in advance