EF not throwing DbUpdateConcurrencyException despite conflicting updates

I got this working. In step 5 of my question, I changed this line:

dbCompany.RowVersion = updatedCompany.RowVersion;

To this:

Context.Entry(dbCompany).OriginalValues["RowVersion"] = updatedCompany.RowVersion;

Now EF throws a DbUpdateConcurrencyException when trying to save dirty data!

I am working with an abstraction of Entity Framework and I don't have access to the EF context, but I found that writing

updatedCompany.RowVersion.CopyTo(dbCompany.RowVersion, 0);

solved the problem.

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