Customers know their pain. Don't expect them to innovate and create the solution for you, but get them to describe the problem. You can then go back in other rounds offering potential solutions through prototypes. Try to keep moving towards getting them to commit (i.e. pay). Ask what it would take to make them buy, what they'd pay, etc.
It may not be easy to do, and I agree that people don't know what they want, but it took these guys 10 months to do any research. They shouldn't have built a thing, but should have put prototypes in the hands of customers ages ago. Then they might have learnt the things 10 months ago they're only just learning now.
There's the old adage from Ford "If I'd have asked customers what they wanted, they'd have said a faster horse". But that's asking them for a solution. It's your job to come up with that. But the customer is the one who knows the pain. And if they can't describe it, it's not big enough to solve anyway.
Nail it then scale it (www.amazon.co.uk/Nail-then-Scale-Entrepreneurs-Breakthrough-ebook/dp/B0055D7O1U/) describes a practical product development process that puts research at the forefront.