[Android Head-Units] Didier99:
I just received this unit:

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Summary in case the link dies, it is a 2013/14/15 Altima specific radio, but the underlying hardware seems fairly generic. Similar units are available for a number of different car makes and models.

If you are considering an Android head unit for your car, you must first read these links.

https://xdaforums.com/wiki/Generic_Android_Head_Unit/MCU_Explained

Note that the links below go back to head unit designs that were available a few years ago and much of the comments and problems do not apply to current hardware.

https://xdaforums.com/wiki/Hui_Fei_Type

and

https://xdaforums.com/showthread.php?t=2660662

I like that it has a full 8" screen but also has buttons and knobs which integrate very well with the car's dash and make use in a car much easier and safer (touchscreen-only controls in a car is a safety hazard).

The price was very attractive and I was able to separately buy a PX5 core board (4GB/32GB) for ~$100 (not received yet) so I will have options in case the PX3 CPU is too slow.

The unit appears well made. I have been running it on the bench for about a day and most everything I tried seems to work as expected (caveats below).

The LCD is good, with very wide viewing angle (one of my concerns), the resolution adequate (interestingly, the 1000x600 screen is much better than the pokey 480pixel units on the $600 Pioneer unit I checked at Best Buy), the touch screen is very responsive.

One strange issue is that it takes A LONG TIME to download anything. The web browser (Chrome) works well, but downloading apps from the Play Store takes forever, even though if you are patient, they eventually complete. I have read in another thread that it may be due to insufficient cache space. Whatever the cause, it is irritating, but it is not something you do too often (aside from initial setup,) so it's not a deal breaker. I will report if the PX5 coreboard improves on that when I get it.

Aside from the downloading slowdowns, the unit seems to handle multitasking properly. I was concerned about the Px3/2GB RAM set being underpowered (which is why I bought the PX5 coreboard) but it seems quite usable as is. I suspect that earlier units with 1GB RAM do not fare as well.

Now some random observations:

The radio app works but the UI could use improvements. There does not seem to be a way to name the stations once they are memorized. They take the name of whatever is streaming out of the RDS system, so most stations I saved are named from the song they were playing at the time...

Navigation uses the iGo app with naviextras.com maps. The maps appear to be several years old. There is a particular issue in my street that has been fixed just about everywhere (Google maps and the various GPS nav units I have had my hands on) at least 3 years ago but it is still there on these maps. Not sure how to upgrade the maps since the radio is not registered on the naviextras.com web site. I have placed a question in the customer service area of their web site. They want a zipped copy of the license folder. I have found the folder but not managed to do that yet.

The music player is also adequate. I have not found how to transfer music from the thumb drive to the radio itself using the stock FileBrowser app . That will probably require a separate file manager app of some sort. There is an equalizer with separate sub setting. Interestingly, I have been using the radio with a set of inexpensive Harman Kardon computer speakers (using the RCA output connectors, not the speaker outputs) and the sound is pretty great with the equalizer set to flat. The noise level is extremely low (I am using a well regulated power supply, I will update once the radio is in the car with engine running.)

The radio does not shut down when "powered down", it just goes to sleep. Current consumption in sleep mode is very low (I measured 15mA.) I turned it off last night before going to bed, expecting it would take the ~20 seconds to boot this morning. To my surprise, the radio turned on as soon as I pressed the power button. This is even faster than my Altima's OEM radio! A pleasant surprise.

I bought the radio with a separate Bluetooth ODB scanner from the same vendor as it is advertised as supporting it. The Torque app is installed in the radio, so it seems it is ready to go (I have seen some older Android head units that could not access Bluetooth OBD dongles.) I have not tried it yet.

I connected the radio to my Android phone via Bluetooth last night but did not do anything else then. This morning, while eating breakfast with the radio playing music, the phone rings in the radio and I heard a voice mail from DHL advising me of the impending delivery of the coreboard. So I guess the phone link works too :) Interestingly the phone was a good distance from the radio (I have a big house) so Bluetooth range is plenty, much more than adequate.

I was reluctant to log into the radio with my main Google account (since it would be easy for anyone breaking into the car to have access to all my Google information, stored passwords and such, so I created a second account with simply the few phone numbers I am likely to want to call from the car and used that to log into the radio.

I have not been able to place a call directly from the radio via voice command or otherwise. I was able to make it read my phonebook from the Android 5.1 handset, so when I ask the radio to call my wife, it properly finds the number and it displays a green handset saying it is calling, but nothing is happening on the phone. A problem that I need to resolve before putting the radio in the car. Note: I also have a Bluetooth headset for my motorcycle helmet and I have no issue calling any number of the phonebook through that, so the issue is not with the phone.

When a call comes in, the phone app opens up and everything works pretty much as expected. Sound is pretty good on both ends. However, the phone app has a row of buttons at the bottom of the screen and some are semi-transparent while others are opaque, so depending on what app was running, those semi-transparent buttons are not legible. This is very strange. When the call was over, the radio which was running did not turn back on (but when I got the voice mail from DHL earlier, the radio turned back on after the call.)

Overall I am quite pleased. I have a couple of bugs to fix before I install the radio in the car. I will report then how that went.

Edit: The MCU version in that unit is MTCE_KGL_V2.70_2, Oct 22 2017