What?!

That sounds totally bogus. You don't have to update the BIOS to support Ryzen. Ryzen is the first CPU on AM4.

You don't need "DDR4-2133 sticks". Ever. Any DDR4 sticks can run at 2133, that's literally the DDR4 standard, everything above is overclocking. 2133 rated sticks are the cheapest (and worst).

I got my R7 1700 and mainboard yesterday. Everything worked on first try. Speaking of DDR4, my 2400 rated (Hynix) sticks overclocked to 3200, with decent timings, even :) (Well, decent for Hynix.) My previous system (overclocked non-K Skylake) couldn't run these sticks above 2450.