!!!!!UPDATE on 2020/04/05!!!!!
A new bitstream TRB is released.  F1 / F1+ / F1U all support it.
Blackminer F1     Hashrate:   4.7GH/s  
Blackminer F1+   Hashrate:   7.05GH/s
Blackminer F1u     Hashrate:   9.4GH/s