It is problematic absolutely, without a company admitting they have adjusted the eq. It will only ever be hearsay.Unless B&W is saying that the firmware update was intended to adjust the sound, it makes no sense to believe that it is. The idea that companies use firmware to fix sound without admitting it is essentially the stuff of conspiracy theories. It takes on person who believes in these things to update the firmware, "hear" a noticeable difference, post about it online and start the chain of suggestion and suddenly lots of people "hear" the difference.
This happens all the time, people claim to hear differences, you look at what the company states the firmware update addressed and see not a single mention of sound quality, and yet once somebody convinces themselves it is true, there is no dislodging them off that belief. I have even seen this happen when the company publicly states there are no sound fixes and yet people simple double down on their assumption and become convinced that the company is just trying to hide the need to fix the sound so they fail to disclose that was part of the firmware update.
I am not saying that a firmware update can't address known sound quality issues, but to assume that one does without the company who authored the firmware update disclosing it publicly is problematic.
I can assure you the sound from 1.1 to 1.2 is very different. The recessed vocals and less attack of drums on 1.1 was so evident. When my firmware changed, i have not had a recessed vocal since, and drum attacks on songs i critically listened to multiple times(the white stripes)and was gutted at the lack of attack, with the update, the drum attack is right there. I critically listenwd to the headphones when i first got them, many tracks and passages of tracks over and over, becasue i was either amazed or disappointed. When the formware updated i could go back to these tracks and passages, and easily hear they were very different.
I dont find myself wanting to listen to the ypdated headphones as much any more, they just arent as fun.
Just release a proper EQ bowers, youre cheapening yoursleves by not. These headphones are so capable, but peopel withbthe carbon 1.2 will never know exactly how capable.