Nokia :: Cannot Use The Lock Code In 5800

I've got a Nokia 5800.

Soon I made the update to v 31.0.101 (31.01.101.202.05).

The problem is that i cannot use now the lock code. I try 12345, because I did not change it never before. But the phone doesn't accept any lock code, it always say failure!

So, I cannot change or use the lock code of the phone.

[I did not try to use the lock code before the update, so I don't know if the problem was before too.]

[One strange thing: If I try another numbers differents of 12345, the fifth time the phone says wait 5 minutes; but if I try 12345, I can try it lots of times, never say wait 5 minutes]

[I suposse 12345 goes on being the right code, but the phone accept NO code]