The serial port seems to work fine otherwise though I wouldn't think 2 drives would go either, but to be fair one was suspected bad & the other was new & never tried so I thought maybe it's possible. I can communicate w/the player & get a bash prompt. I have also tried this (builder upgrade w/both of my players a Mk2 & a Mk2a mostly w/the 2a. Now I must say at this point that the 2a had a 2beta13 running on it initially (I thought all along it was loaded w/2 final-I don't use it much) I quickly put a ver. 2 final on it & tried some more.