Add old FSI support

spec/bios.spec.js

@@ -48,4 +48,8 @@ describe("Decryp BIOS", function() {
         expect(bios.Insyde.check("1234o678")).toBe(false);
         expect(bios.Insyde.check("12345678d")).toBe(false);
     });
+
+    it("FSI 20 dec old key for 1234-4321-1234-4321-1234 is 10cphf0b", function() {
+        expect(bios.FSI20DecOld.solve("12344321123443211234")).toEqual(["10cphf0b"]);
+    })
 });