I’ll second what other users have said in regards to the effects of the Pontus II update: I noticed increased clarity and more detail right away. The bass may be firmer and perhaps lessened a tad. Someone else mentioned a brighter sound and that may result in a perception of lighter bass. The sound may have lost a smidge of the organic feel at the expense of detail but I enjoy the detail. We’ll see how much the sound changes with break-in but I’m happy I did the upgrade.
Make sure you download the latest version of all files vs using what you may have installed from a previous firmware update as my upgrade process failed at the last step until I installed the latest software versions.