I don't want a refund at this stage. I already ordered and paid for the assembly. I rather have my hardware and hash or sell it, instead of getting a refund from yifu which will likely take ages. I don't want next-gen chips from yifu, because I saw the lack of skills, trust and anything else on yifu's side. Best would be partial refund/compensation I think. Getting my btc back simply doesnt do it anymore at this stage for me.

I would:
ask for the chips asap and demand a compensation. If no compensation or chips - sue his ass!