Hi, I would suggest that you talk to your dealer about this. They are there to support you, and can liaise with Naim, as well as helping you to determine whether the changes you hear are similar to other units.
I understand Naim are under pressure from the likes of Apple and Google not to allow people to use old firmware which includes their services, i.e. AirPlay and Chromecast. This was not an issue with the old streamers, so reverting to old versions on them was straightforward.
For me (on NDX2) this update was an improvement, which seems to be the majority view here, but if you’re not happy, lets hope you can reach a resolution.
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