Wasted money on junk xiaomi phone

Today I bought Xiaomi 12 pro for 100$ (a lot of money for me) it's considered a "flagship phone" by xiaomi back in the day, but after I got it home tried to unlock bootloader but it made impossible by xiaomi (I did checked on LineageOS site and see that the phone is supported with my model number that's why I bought it), you have no idea how much I wanna throw it to the brick wall but I need a phone for work I spare it for now but when I got my old Pixel 3 fixed I might have a little "fun" with it.