Original Denafrips Terminator: Firmware Update?

I have an original Denafrips Terminator DAC (with upgraded DSP board) and I'm  still running the original firmware. Many consider the original Terminator to be the most "analogue-sounding" version, and I do like mine very much.
However, I can't shake my curiosity regarding subsequent firmware updates. Denafrips advises caution, as it might not be possible to revert once updated.
Do any of you have (or have had) the Terminator and have any recommendations?
Thanks.