Finally HtheB's method don't work properly with this one. After keyboard 'chicken run' phone really show message abt closing the lockscreen process, but after pressing yes, phone gone to reboot and blackscreened with Nokia and small white wrench. I'm connect it to PC to last OCF and as I understand it shows it's real FW: "DFL61_HARMATTAN_0.2011.21-1_RD_001". So, best way to use this N950 as normal devkit w/o any troubles with lockscreen is to reflash it with retail FW (from one of OCFs), right?