What is SBC? You swapped or modified some hardware and forgot to mention? I don't follow, stop mixing full and standard unit again, you were working on full unit issue which is now fixed, its mining and syncing blockchains, yes/no? If yes, then problem solved, move to next problem, but do not mix everything together.
SBC, single board computer (what makes the FULL model a FULL model). To test the miner, as suggested by others in this thread, I moved the SBC to the working STANDARD unit and now that unit does not mine also. The original one which had not been mining now does, except at a very high HW error rate.
I am not a seller. To my understanding, your miner is working again, and standard unit is also working, so you have 2/2 working units. yes/no? Please explain in detail what was broken and what you fixed, because your post lack details needed before I address what you wrote.
I understand you are not the seller. That comment was not directed at you. I am not trying to dialogue with you--I am interested in someone who had a similar experience helping, or someone who knows a possible solution. The issue clearly lies within the SBC.
I have contacted FutureBit via my order email and will await their reply.