I've installed beta six of el capitan and firmware updates from a source. This has caused issues and I'm not able to get past the login screen screen goes black and screen flickers freezes. Eventually reboots. I don't want to loose my data and I'm able to see it by command shift R. Recovery. Therefore I can see Yosemite .app and dmg file and I also have el capitan install files. This disk utility is different. I have a usb and can format it. Tried using terminal to write application location to install on usb create installmedia (Sudo) didn't work. Options. Shouldn't I be able to install those install image / dmg files. I'm lost. I know there is a common sense response to this. Spent touch time confusing myself and hot lost. Also when internet recovery - gives me lion. I attempted to install on a new partition sense I didn't want to loose my data I partitioned drive. Installing lion from net recovery - failed said OS x recovery not found or located or something. Pleas help me.