I need help with parts ID and firmware install  

I need help with parts ID and firmware install

Hello everyone,

I spent the last 3 weeks that I've been stuck at home upgrading my Franken-Prisa to the MMU. But I'm not sure what version everything is and thus what firmware to install on the unit. It definitely started out as an i3 Prusa MK2S. That's for sure. Then to upgrade to the MMU2 (it was an MMU1) then had me first upgrade to the 2.5 (not sure if it's now 2.5s or just 2.5). Then I upgraded to the MMU2s (i think). I bought the kit for the MMU2s in February of 2019.

So, I'm not sure what firmware I need. Either I need this firmware because I essentially bought the MMU2s upgrade kite

ORIGINAL PRUSA I3 MK3S/MK2.5S MULTI MATERIAL 2S 

Or do I need the 2.5 firmware (without the s) because I believe my upgrade kit from MK2s was only to 2.5 (not 2.5s???)

ORIGINAL PRUSA I3 MK3/MK2.5 MULTI MATERIAL 2.0

Any help to get me printing is greatly appreciated! Here are some pics of the printer for reference.