Managed Chromebook

I bid on a storage unit & won. Inside was some computer. A few Apples new and old IMac to MacBook 2015 and newer I got all to work. A few desktops same outcome but their are two one Chromebook & one laptop that is bitlocked. I’ve tried everything that I know of. 10 years of tech support. My question is what else can I try? If I remove the C-mos will that help me reset it? But my main question, the one that I’m actually here for is are thier any hidden or secret keyboard combos that will help me get thru a managed Chromebook. My contact is cdussery05