Acer Iconia W5 completely locked out. Any suggestions?

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Windows Central Question

Acer Iconia W5 completely locked out.

Got this from a car boot sale. It came with docking station and has Windows 8.1 installed but has been completely locked down.
Basically I can't get into Windows 8.1 and the BIOS password is unknown - looks like USB has been disabled.
I have tried shift/restart to get ot extended options but again everything is tied down with a password.
Don't know how to proceed - is there a master reser for BIOS?
Thanks