SE K550i reset user code

Hi friends. I have a problem with phone SE К550i. Phone is CID 53 DB 2020 and because of this I can not unlock it with SEtool or XS++. The phone is with activated user phone code (always want) and in start want this code but his owner (friend of mine) did not remember the code. He enter the code before, but now he forgot it. The code is not 0000. I flash firmware (with FAR) with such as w610 but its not help, still want a code. Could you help me to reset this user code or to learn it ?
Thanks in advance.

I learned the code. The owner remembered.