Well, I managed the problem.
I simply forgot that last time it was the /dev/sda3 declared as the main partition, not the sda2.
So during mkinitrd-ing, the sda3 should be placed instead of sda2.
I corrected this problem now by using "cryptsetup luksOpen" entry option which gave me emergency pass into sda3 partition.
Further I issued:
than I mounted appropiate partition as /root and chrooted into it.
Next I mounted /dev/sda1 as /boot and issued proper mkinitrd command.
After running lilo and reboot, all went fine.
Uffff .... an unexpected sunday burden went away