Help Custom binary blocked by FRP Lock

[MrSoHot]

Hi, I have a Samsung Galaxy On5, that I litreally got last week, but now I can't turn it on for some reason. I've been trying to fix it all day but with no luck. Here's some things I already did.

Used SamMobile and found some firmware that I think matches my phone (even though my model number exactly wasn't on the site)

Used Odin but with no luck and kept getting a Booting error.
SECURE CHECK FAIL : (BOOTLOADER)

I seriously need help with this because if I don't get this fixed then it's no more phones for me.

 

[Hadron]

I'm not a Samsung expert, but I expect that an approximate model number match isn't enough. Can you tell us what exact model it is?

Also, what had you done before this started? It seems to be saying that it's detected an unauthorised system modification. Knowing the cause may help identify the solution, or at least provide a warning to others who might read this.