Can I just buy the custom firmware,
becuse I already have 2 R1

Yes and thanks you answer,
I find some solution,
like this:
https://fanbitcoin.com/index.php?topic=827356.1085;wap2
but need trying
 

Hi All,

have anybody can help me?
I  connect R1 with seven U3 used orico usb2.0 10port hub,
U3 will break every 3 hours,
BitMain say only three U3 can be connect R1,
This is correct?
have any solutions?

Thanks

shih