I have a 1st batch A2-90, but it never goes above 82Mh/s, I've tried many ways, but still no dice. It may have to do with the fact that 3 out of 6 of the blades have less than 430 cores in them. Could this be the issue??
Its same with my miner, the early series have higher HWs and can use max 1200mhz.