Problem N99i

[kartina78]

Hi,
Please help me.
I have a CECT N99i.
I'm entered the secret menù (*#3646633#),
I activated the high speed sim and
the phone is switched off after 3 second.
Now I can not switch on the phone.
How can I do?
If you do not know, you can ask a friend of China?
Thank you so much if I solve the problem.
pasquale1978