Question Unlock frp lock


Hello ! I have several types of Samsung and I can't put a custom ROM or a custom recovery on almost all of them, when I flash it from Odin I get a fail with the following message displayed on the phone: "custom binary frp lock on"
I saw some tutorials on yt but all of them were doing the same thing, more precisely flashing the stock ROM from Odin, I also did this but I didn't manage to unlock the bootloader, i.e. frp lock.
I also looked for some solutions on this forum, but in vain.