[Elbasha2005]

Hi
I tried to unlock my realme C25Y with unisoc T618 bootloader by the tool used in this video 

https://www.hovatek.com/forum/thread-32287.html

and when I wrote ./fastboot devices it gave me
 zsh: exec format error : ./fastboot

I gave it all possible permissions and it didn't work
What should I do?

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[Gargoyle]

Realme uses its own rsa key to sign partitions, it cannot be unlocked with "rsa4096_vbmeta.pem" an Identifier Token.

[Elbasha2005]

Realme uses its own rsa key to sign partitions, it cannot be unlocked with "rsa4096_vbmeta.pem"  an Identifier Token.

Ok
Do you know any method to unlock it?

[Gargoyle]

Realme uses its own rsa key to sign partitions, it cannot be unlocked with "rsa4096_vbmeta.pem"  an Identifier Token.

Ok
Do you know any method to unlock it?

Pandora Tool can unlock the bootloader,

But if you plan to root, unfortunately it won't be possible because this device won't accept an unsigned image, you need the key used by the manufacturer to sign the boot.img file and create your custom vbmeta.