need help with new FW for my PDNW

[NuUser]

Hi Guys,
I did some research around the web it seems the very last version for root is FW: SH20 version, but however my is FW version is SL20_201202240_B_PD_INX7E_ENG_6410POP It just don't take any version of tool posted on the web can anyone tell me where did I do wrong?

Thanks

WS