Unblocking the bootloader to save device from landfill

I have been asked to save a Samsung Galaxy Tab A from landfill. The device works perfectly and is not damaged in any way. However a Fencing company has blocked the bootloader so that the only app that runs is their own company app. They have provided a new tablet and instructed that this one should be thrown away. The owner quite rightly thinks this is a terrible waste. I have tried a full firmware re-install using Odin, but that changes nothing. If I try to access any other app the message that the bootloader is blocked is displayed. The connection from the tablet to a computer is also blocked by “Company security”. So can anyone help me bypass this corporate software and enable a perfectly working tablet to be used again?