yeah that def worked because i can byte reverse the file, then after the while loop i can write it to disk/hdd. i can also seek and read it ;) which is what i was after lol.

here is the final working code:

open ( my $in_file, '<', "file" );
binmode( $in_file );


my $mem_file;
binmode( $mem_file );

my ( $buf, $data, $n, $bytes ); 

while (( $n = read $in_file, $data, 4096 ) != 0){
     $mem_file .= pack( "v*", unpack("n*", $data ));   
    $bytes+=$n;
    
}


open ( my $otherMem_file, '<', \$mem_file ); 
binmode( $otherMem_file );

seek $otherMem_file, 0x00, 0;
read $otherMem_file, my $temp, 0x1200;

open my $out_file, '>', "reversed";
syswrite( $out_file, $temp);
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and it give me all expected results byte for byte. :)
also i should add that i am parsing the file using its hexadecimal representaion of a binary file and i honestly dont think you would even need to binmode any of these files and it doesnt need file::slurp. completely independant code teehee