bjorkostof

Hello there.After doing a lot of research myself i'm stucked.My chromebook don't recognize usb when i press ctrl+L What i've tried did do far : put in developer mode after start up press : ctrl+L got black screen with only the installed OS,no option to chose other nr ctrl+alt+ right arrow login = chronos sudo=bash from there execute the cmd = crossystem dev..... so i know i do something wrong,really want to get on with this so i hope someone can help greetings,bjorn