Hi, tried using castscreen but my CMU's memory is overloaded. I think I had too much tweaks. I reinstalled my firmware today to make a clean install of castscreen as well as trying out a new development: Android Auto! It is currently in beta version but I'll test it out and update you.

P.S: Someone is already developing a mirror compatible for iOS 

I've not tested the android castscreen from AIO V1.41.

However, I've the opportunity to test the screen mirroring from Mazda Media Player v0.3.1 (Mazda Media Player). It works on my ride.

Hi, just tried android auto. Works! Very elegant UI to connect, by going to Apps > Android Auto, meaning it is intergrated as a native app!
Pretty cool, but your Android will be in driving mode and while it can take calls and whatsapp messages (it reads it out to you), it's pretty limiting. CastScreen is the best though. I can use Waze from my Android, and audio is played through car speakers. Latency very very minimal, you wouldn't even really notice it. Basically anything you can do on android you can through Mazda Connect Display. Touchscreen on Mazda Connect does not work. Reverse Camera may not work.

AT YOUR OWN RISK
Please remember that these apps are only suitable for V50 and above. Apps may interfere with reverse camera and audio. Understand that there is a risk of bricking your system so don't do any of the below if you don't know what you are doing.

ANDROID AUTO
1.  Install Android Auto app on your Mazda Connect
2.  Install Android Auto app on your phone
3. Connect the phone to USB and pair the phone bluetooth with the CMU
4. Switch audio input manually to Bluetooth Audio
5. Click on the AA icon under Applications Menu on the CMU
6. A black screen with credits should open up first.
7. Android Auto will then start. If it does not, pull out the USB and start over again (or check the installation.)
8. 2 ways to stop AA - Disconnect the USB cable or use the onscreen menu "Return to Mazda Connect" on last screen with speedo icon.
9.  Here's a video.
10. This option does not need wifi.

CASTSCREEN
1. Install castscreen receiver on Mazda Connect.
2. Install castscreen on Android.
3. Select > H264 > 800x600@160 > 1 Mbps > Server Mode > Start.
4. Plug in your Android with data & charging cable (not all cables can be used for data transfer) and done.
5. Here's a video.
6. This option does not need wifi.

MAZDA MEDIA PLAYER
1. Install the Mazda Media Player app and connect your Mazda to your mobile's hotspot.
2. When connected, check in your phone connection settings and look for your IP address info that should look like 192.168.0.13.
3. Launch Mazda Media Player and input your IP address, other fields do not edit and press connect.
4. Use USB data & charging cable and launch Mirror, if successful it will immediately launch.
5. This option doesn't need to install anything to your Mazda Connect.

How to install app to Mazda Connect via USB
If you are unsure how to install apps on your Mazda Connect you can click here or download here, all installation files are included in this All-In-One(AIO) app, just have to select which tweaks you want to apply. Only USB 2.0 can be used, preferably <8GB capacity.