Oh, I see, I didn't know that. Partly it is understandable from the point of view of the manufacturer, but on the other hand, they should do a much more flexible firmware.
Generally I would be happy with a higher level of openness/interoperability/transparency in the mining HW business.
The thing is, Bitmain does that to STOP you from tuning them. They make a lot of money by using market diferrentiation...
They take a 95TH unit, and re-tune it and it's a 110 TH unit. But they sell it for thousands more.
They don't want you buying the cheap unit and tuning it yourself.