Hi jezzarino
I can help you to update the Renesas USB 3.0 firmware 4021, that was released for the SR and TO boards only.
I have updated my SI board, and the long boot error is solved.
You can PM me your E-mail, and I will send you a guide and the how to do it + the firmware 4021 and update program.
Why Inte/Renesas can't release it for the SI board, I don't know. Perhaps they got lazy.
Regards
Nighthawk