I'm not sure, have you contacted Hisense's customer service? They get back quite quickly via e-mail and have a contact phone number as well that's usually quite quick to answer, though its a UK number, not sure how they are contactable in Croatia.
Thanks for reply.
Yes I did.
First sent email to UK, where they gave me instructions how to factory reset, but that is what I already did.
Then I sent email to nearest center in Slovenia and they gave me contact email and address in Croatia. So I found their central phone number where I got service number in Croatia, but nobody is answering on that number and I will try again tomorrow.