I am also a batch 4 customer, really kicking myself for ordering now, I went for the upgrade kit too.
I have been trying to get a refund and paid in Dollars exchanged from UK Stirling.
I modified their official refund and release form for a batch 4 customer.
I sent it to refunds@hashfast.com and Erin (customer support manager) acknowledged receipt but has not confirmed if I will actually get paid out. I have sent several emails asking but no reply.
It is really frustrating that you give what appeared to be a legit company your hard earned cash for a product that may never come and yet the don't even have the curtesy to reply to a few simple questions!! Rant over!