Complete phone backup (fullflash)?

[pampi]

Is this possible to create raw backup of phone's memory in sense of drive images done on PC, so that I'm able to safe roolback if things go odd and the phone can't start?

Yes it is possible.
Download the file I've attached.
I believe you are using a A2 Phone.
Just start A2Uploader, extract the attached file and browse to "a2_fs_backup.txt"
in MISC on A2Uploader, then hit "Write Script".
You'll see a new folder appears inside where you have A2Uploader.

Good Luck!