question for you all. One of my guys "upgraded" an Antminer R4 batch 6 to the latest Antminer S9 firmware. That upgrade went through just fine....and now it won't hash, of course.

It won't let me replace the Antminer S9 firmware with the correct Antminer R4 firmware.

Anyone know where in the R4 filesystem there might be a file or setting to change to get it back on track?