Hello. I bought N9 today, install various soft and Filebox root. But, when i tried install Ubiboot, it turned out what past owner installed lock code, that will never be asked. So, when i have root rights, i can find files, that needs for lock code and delete them?

I'm afraid what when i reflash new firmware, lock code still will be there also i can't find my current 10.2011.34-1_PR_001 rom and i don't want to raise firm version.
Any ideas?