E80 connected to a DSM300, can't update

[josesirven]

I just tried this and I couldn't update the DSM300. I started poking around and I noticed my DSM300 and E80 are connected by two seperate cables joined with a small rectangular box that says CAT5e Cross-Over 1-3, 2-6, 3-1, 6-2 and wiring 4, 5, 7, 8 no change. It looks like an adapter used to convert straight cables to a crossover cable. I read somewhere in the internet, I don't remember where that you can't update the DSM300 with a cross-over cable, is this true?

If this is true can I just temporally connect both units to a small network switch with power and try update?