Well, I successed.
I had PR_LEGACY_342 version.
I did that:
Flash firmware with the same version to return to closedmode
Enable dev mode of course
Install cal-writer program
Put cert with PR 1.3 001 version in /root/ (as cert.bin)
Chown /dev/mtd1 to root:root
Open cal-writer
Chown /dev/mtd1 to cal:cal
Flash 001 version of PR 1.3.
Now I have first EU firmware for PR 1.3.



But, is it possible to downgrade to PR 1.1/1.2?
I heard about CMT problem then. Has someone tried that?
Maybe I could try? I have one N9 in very bad state, that has not working SIM slot, I use it for modding.