Ok, i 've enabled R&D mode but now it's stuck witch a wrench on the screen and nokia logo for a while only to disconnenct and connect every few seconds. Is it possible to flash a phone without the latest system version? I mean only with the version that i already have? And how do i know whats the image name for eMMc? I also found something about cleaning rootfs by flasher but i dont know whether it is important or not.

Sorry for so many questions, but i am a noob who is just trying to learn.