emusonacid! legacy

I recently picked up an old E64 just have a few questions:

I read on this board that these older models cant go above 3.0 but I also read somewhere that there was a memory upgrade that came with the soundrom 2.

Now my E64 has the sound rom installed and currently has EOS 3.2e

Does that mean it is possible for me to go all the way upto 4.61?

Thanks

yes