Yeah, definitely do not have emunand on my sd card, so that shouldn't be an issue.
I'm currenlty using SD OS 2.5.3. Funny you mention that, I had to originally use 2.0.1 as I needed a version compatible with OFW 1.0.0. Once I upgrade to 6.0.1 I was able to start using SX 2.5.3 without issue...