I would like to add that I seem to have issues with this as well - to be honest I'm not even sure if there is a way to tell what firmware version I'm running?!
There is an app. but not sure what purpose it serves, I cannot seem to get any meaningful information out of it - not even the firmware version or the ability to run any form of updates.
Coming back to the topic on hand, pressing the SUB option on the remote gives me 2 blinks versus the 3 blinks that the Bass Cut option is supposed to have.
I have a 2 GB freshly formatted USB stick that houses the 3 .bin files - and I have tried this 3 times already.