Two had working S9's, is combining Hashing boards possible?

[Brokerstar]

So I have two Antminer S9's, both are 11.85Th versions.

Now one uses V4 hashing boards and the other uses V5 hashing boards. Both of them have a hashing board missing each (the hashing boards failed and I sold them on Ebay).

Now I want to create one 'complete' miner again and want to know if there's a way to put three working hashing boards together in a miner (say two V4's and one V5).

Now I've tried just slotting them in and no luck, but wondered if there was something I could do with the firmware to address this? This is where my 'expertise' finishes sadly.

[fanatic26]

With the speed you listed im assuming these are early batch and the same speed. You can mix and match the boards, the v4 and v5 wont make a difference.

[MinerMEDIC]

Have you tried them all individually on that controller? About the other controller? Is it the old-style or the new ZYNQ?