Sony WH-1000XM3 - v4.1.1 firmware failure?

[GapsOfTheGod]

Having updated my 1000xm3's over the wekeend, there seems to be an introduction of hiss and a background noise of what sounds like distant traffic (even though I can hear nothing at all without the headphones on) when using Active Noise Cancellation, which was previously stellar. The potency of the noise cancelling is noticeably weaker since updating (I'd estimate around 40% less). Familiar auditory environments which were previously rendered almost entirely silent are now notedly audible. I've checked that the noise cancelling slider is left-most, and indeed it is.

I'm also disappointed to find I can't ask Alexa to play music from Spotify, and I press the button and just say "Play Metallica", it responds with "Shuffling music by Metallica on Amazon Music", yet nothing plays at all.

This update is very much a downgrade as it stands.

[simonweppe]

If you sign up for 'Email me when someone replies', you'll have the whole trail. 

Also if anyone could do a walkthrough on how to downgrade somewhere, that'll be amazing!

[Vannglorious]

Because that means they lied about it... They stated it can't be downgraded. Now we all know it was a lie obviously.

[sidpc8686]

Hi, where can I grab this from? thanks

[Haraldboye]

https://paste.ubuntu.com/p/sfRxbYVZrF/

Lets see how long this stays until deleted

[mrlemur]

Doesn't work for all models, there is an issue with some newer (maybe older) models.

[alissamln]

Can’t run Python script, always have error messages ( Win10 and MacOS ). Which version of Windows and Python you are using to downgrade?

[Lasse_K]

I've spent the last 6 hours figuring it out. I can now confirm that there
is a way to downgrade. However it involved methods that are in direct
violation of Sony's intellectual property.

I saw in another forum that someone had got hold of way of decrypting an
XML file. I'll report my progress within 30 minutes to an hour.

I'm also hoping this post doesn't get deleted as I'm not spreading any
links. I just want to inform my fellow forum members about this.

On a final note. There are two models. Each requiring a certain method.

Regards.
/L

[mrlemur]

I can confirm that there are two versions of the script. I used the second one and it worked as expected. 

[Lasse_K]

So do you notice any difference? ... I'm not sure if I do. /L

[uninterred]

I cant run the script either on mac. Keeps coming up with an error, tried changing forking to threading but it made no difference.