#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(void)
{
  int fd;
  unsigned char data;

  printf("Disabling WiFi whitelist check.\n");

  fd = open("/dev/nvram", O_RDWR);
  lseek(fd, 0x5c, SEEK_SET);

  read(fd, &data, 1);
  printf("CMOS address 0x5c: %02x->", data);

  data |= 0x80;
  printf("%02x\n", data);

  lseek(fd, 0x5c, SEEK_SET);
  write(fd, &data, 1);

  close(fd);
  printf("Done.\n");
}