Hello I need help please thank you in advance

I received a "MacBook Model A1706 " device because it is locked with a passcode and also through recovery mode there is a "EFI" lock.

I forgot to backup the original BIOS file and wrote a file from the Internet.

Now I am facing a problem. In the device disk utility recovery mode, the storage capacity shows only 1 GB and there is no other information or another Partition.

I tried to write several other Bios files and the same thing, there is nothing new, the problem is still the...