Have a standard unit that wants to be stubborn. (ECO mode). I'm wondering if this is related to a problem mentioned earlier:
The USB connected hashboards is a known issue we are trying to figure out if its a firmware or general STM32 USB driver issue. Usually a power cycle on the standard unit will fix it if its taking a really long time to connect. - jstefanop

SIDE QUESTION: Can these units (SHA-256) be used to mine from pools that use SHA-256D?Does it hash at all, or it is always 0? Could be a firmware issue we had with a small number of units (wrong firmware at factory). Shoot us an email either way.