Carputer-shop.co.uk

SCAM - Despite advertising support for Android, it does not. Steer clear. MST4 does not work.
Please avoid. - If you've got an Android phone, do not listen to their attempts to tell you this device is supported. It is certifiably not.
They have lied on their site saying they have an app on the Google Play store, but they do not. Do not install the APKs they will send you. Could be malicious, and the application will not work, and may steal your credentials when asking you to log into apps. (Such as Spotify, which does not log in)

Their customer support is non-existant, calls and emails asking them to confirm it's support was met with lies, then they further lied after I installed the unit to say that it actually only supports Bluetooth streaming (VERY LOW SBC QUALITY).
They have stated there's no plans to support existing and new Android users, and they will not respond to emails requesting for a return label or let me return it to their store in person...

Do not spend money configuring your car to get this to work, if you have Android, they will be happy to take your money, then tell you you're at fault for owning one.

I have call recordings, emails, screenshots of their website, and "wayback" archives that show their site continuing to advertise USB audio, when it does in fact NOT work. They will not be supporting this device, but are happy to continue selling and purchasing more stock.
Worked as a developer and electronics engineer for 15 years, asked if they could provide me information on the device to see if I could personally get it to work, they would prefer to not help at all.

They never pick up their phones, they never responded to my emails, and they falsely advertised features they knew full well was not supported when I spoke to them.

Thanks Richard, £400 in total on the device, and a car config change to disable the MOST security system to make it work for absolutely NOTHING.

Just buy a decent quality LDAC or APTX bluetooth adaptor for less than £50 and use your existing AUX with it. It's not the best, but I'm sorry, they do not care either way. This is just a glorified £320 bluetooth adaptor. You can simply buy a harness to add decent Aux quality if you have an "Aux" feature, and you can bypass the bluetooth if you only have that and add Aux much cheaper and tidier than this unit.

It may have supported Android years ago, but this seems like a Bait & Switch scam...

Tried many different phones of varying models, manufacturers, and versions of Android. Please do your research, you'll see they've abandoned all their existing MST4 customers.

No USB audio support, no bluetooth steering wheel controls if using aux instead, no hands free if paired and using aux, no further firmware or app updates, no app on the playstore, dodgy APK downloads, no spotify support, and no support whatsoever on calls, emails or in person. - All certified and justified by Richard@ Grom Audio